Its pretty fun, if you have a smartphone, I would suggest the C:Geo app. It shows you the caches near you. Its pretty nice to have when you're bored out of your mind with nothing to do :)
I find any number of things, it's jokingly described as "Using multi-million dollar military equipment to find Tupperware in the middle of the woods." To date I have found caches that have been as small as a personal pill key fob and as large as an ammunition box.
Give it a shot :) Worst thing that can happen is you don't find it. Make sure you bring something small and tradeable (No smellables...) and trade it for something in the cache :)
If you want. Normally it's just keychains or little toys like a Hot Wheels car, but I have seen a nice looking bracelet and a cup thermos (still had coca-cola in it...)
Well....since you're not supposed to have smellables... And it was only partially filled and I can only imagine the last person who had it... Didn't take it home xD