What are some limitations with contacts?!

What are some limitations with contacts?

I'm thinking about contacts, but I'm wondering...

Can I wear them on Roller Coasters?
Can I wear them underwater (like at the pool)?
Can I take them on water slides (think slides at water parks)?
How long does it usually take to get use to them?
Have you had any problems with them?

Thanks

at first they're hard to get used to.
but, once you get used to them they're great.
sometimes they can be a pain, but i think, they are MUCH better then glasses.
to answer your questions:

yes you can wear them on roller coasters... not reason you couldn't.

underwaterr..not so much, i do sometimes.. just close your eyes rrrreeeally tight, and don't let any water get in your eyes.
if it does, it will probably hurt and they will fall out.
same with the water slides..

it just takes some getting used to, when you put them in. af first it'll probably take maybe 5-10 minutes..one you get used to it, i'd say a minute or less.

yes i've had problems with them.. don't rub you eye to much..they'll go behind your eye, OW.

hope this helps(: