I want to buy or build myself a sling bow. It is basically a slingshot modified to shoot arrows, and can be further modified to be used for sling bow fishing. They are honestly a lot of fun to shoot, surprisingly powerful and straight shooting. Aiming is purely instinctual.
http://www.youtube.com/watch?v=QyxjnDNHW7Y
Would be fun with access to fish that can be lured to the surface easily. Carp would be an easy target, catish might as well.