print paper wallet with cool design, fill with small bitcoin amount, deposit like any other geocacheing treasure.https://www.bitaddress.org
I've hidden about 50 fliers with two instawallet addresses on two versions of the fliers...
No one has claimed thed bitcoins yet.... haha
How user friendly is the paper wallet?
I personnaly have not used one yet, but will look into it when I am on a computer (on the bus right now)
If anyone is near Ohio, USA, feel free to find some of Team_Little_Bear's caches & you'll be rewarded with some bitcoin.