My my... this was hard :O Just going on a whim and guessing everything and hopefully I get at least 1 correct answer x)
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Only Lilly:
Borrowed a neighbour's yacht

Mini Nub:
We know Mini is a prominent contender for a Darwin Award, so any poor decision has to be true! The lie is:
Went on holiday every summer to Tenerife

Redtunnel:
--

Dave:
Fishing

Liz:
I feel like all of these are  true, but I'm gonna have to go with:
When visiting friends from my parents I was in their garden walking around near the water they had there. After a while I fell into the water as I was trying to play with the fish that were swimming in there.

Summer:
Travelled to Mexico on a school trip.

(Seems a bit too expensive)

Sudo:
Do a summer job

Because who works on a summer break!

Jasperine:
They all seem true! But going with:
Destroyed my neighbor's/neighbour's car

Ephesia:
Stole furniture from inside the house and hid them in the forest

Fake:
When I was younger I would steal eggs from my mum and throw them at the wall because I thought it was so funny

Sissy:
I danced on a stage.

Only Lilly
Went to the local river and swim

Mini Nub
N/A

Redtunnel
Building sandcastles.

Dave
Motor cross

Liz
When I was younger I went to fish with my father. When I wanted to throw out the rod I god the wire around myself so I got stuck with the sharp end in my leg.

Summer
Travelled to Mexico on a school trip.

Sudo
Go outside

Jasperine
Destroyed my neighbor's/neighbour's car.

Ephesia
Stole furniture from inside the house and hid them in the forest

Fake Dream
When I was younger I set a quite large field on fire and the fire brigade had to come and fix it.

Sissybear
I went on a boat trip

Only lilly:
2. borrowed a neighbours yacht.

Mini Nub:
2. went on holiday every summer to Tenerife.

Redtunnel:
2. Tubing.

Dave:
2. motor cross.

Alaklondewen/Summer:
3. helped out on an acheological dig.

Sudo/Qevin:
3. do a summer job.

Jasperine:
1. spray painted something vulgar onto my grandfather's garage door.

Ephesia:
2. made mudcakes (out of mud) in the bathroom when my parents didn't notice.

Fake dream:
2. when I was younger I would steal eggs from my mum and throw them at the wall because I thought it was so funny.

Sissybear:
1. I went on a boat trip.

Bump

Bump

Hope i got aleast a few right

Only Lilly
Went to the local river and swim

Mini Nub
Went on holiday every summer to Tenerife

Redtunnel
Building sandcastles

Dave
Motor cross

Cahaya/Liz
When visiting friends from my parents I was in their garden walking around near the water they had there. After a while I fell into the water as I was trying to play with the fish that were swimming in there.

Alaklondewen/Summer
Travelled to Mexico on a school trip.

Sudo/Qevin
Summer Job

Jasperine
Destroyed my neighbor's/neighbour's car.

Ephesia
Ran clad in only a towel over my back straight into the sea, pretending I was Superman

Fake Dream
When I was younger I set a quite large field on fire and the fire brigade had to come and fix it.

Sissy
I went on a boat trip.

Just a couple more days to get your answers in!

Bump

It's the last day to get your answers in!

Lilly - Borrowed a neighbour's yacht

Nub - Accidentally caused a huge grass fire by lighting dead grass and thinking I could extinguish it before it became out of control.

Red - Picking blueberries.

Dave - Motor cross

Liz - When visiting friends from my parents I was in their garden walking around near the water they had there. After a while I fell into the water as I was trying to play with the fish that were swimming in there.

Summer - Travelled to Mexico on a school trip.

Qevin - Do a summer job

Jasperine - Spray painted something vulgar onto my grandfather's garage door.

Em - Stole furniture from inside the house and hid them in the forest.

Adam - When I was younger I was fighting somebody and rolled over onto a smashed bottle and cut a really deep home in my elbow and need stitches.

Sissy - I danced on a stage.

Come on, @Only Lilly, @Karli, @Dave, @Powerless -- Submit your answers!

@Fake Dream, @Jerrol, @Le Marius  etc etc

Let's see how this goes lol.

Only Lilly
1) Went to the local river and swim
2) Borrowed a neighbour's yacht
3) Burnt my back so badly I couldn't sleep

Mini Nub
1. Whilst running down a hill, I tripped and scraped my knee really badly and was left with a scar still visible to this day. (Probably 10+ years ago now)
2. Went on holiday every summer to Tenerife
3. Accidentally caused a huge grass fire by lighting dead grass and thinking I could extinguish it before it became out of control.

Redtunnel
1. Building sandcastles.
2. Tubing (riding on a rubber ring after a boat).
3. Picking blueberries.

Dave
1. Football
2. Motor cross
3. Fishing

Cahaya/Liz
1. When I once was on holiday I and my family went to the mountains. when we were walking there I started to run and after a couple seconds I fell on some rocks and cut my arms open.
2. When I was younger I went to fish with my father. When I wanted to throw out the rod I god the wire around myself so I got stuck with the sharp end in my leg.
3. When visiting friends from my parents I was in their garden walking around near the water they had there. After a while I fell into the water as I was trying to play with the fish that were swimming in there.

Alaklondewen/Summer
1. Travelled to Mexico on a school trip.
2. Rode my bicycle while singer Ice Ice Baby at the top of my lungs.
3. Helped out on an archeological dig.

Sudo/Qevin
1. Play Runescape
2. Go outside
3. Do a summer job

Jasperine
1. Spray painted something vulgar onto my grandfather's garage door.
2. Destroyed my neighbor's/neighbour's car.
3. Unleashed a hurricane of packing peanuts into my mom's living room.

Ephesia
1. Ran clad in only a towel over my back straight into the sea, pretending I was Superman
2. Made mudcakes (out of mud) in the bathroom when my parents didn't notice
3. Stole furniture from inside the house and hid them in the forest

Fake Dream
1. When I was younger I set a quite large field on fire and the fire brigade had to come and fix it.
2. When I was younger I would steal eggs from my mum and throw them at the wall because I thought it was so funny.
3. When I was younger I was fighting somebody and rolled over onto a smashed bottle and cut a really deep home in my elbow and need stitches. 

Sissy
1. I went on a boat trip.
2. I went swimming.
3. I danced on a stage.