Pianos have the advantage that you don't need to build up callouses on your fingers before you can play for more than five minutes when you start, guitar and other stringed instruments can be a pain that way. Whatever instrument you like try it, there are simple things that can be done on any instrument without necessarily being able to read music.

One thing to try is borrowing or renting the instrument first to find out if you're going to put the effort into it or if you're more likely to let it sit in the corner glowering at you. Also it gives you a bit of a feel of the instrument before you start looking at one you want to buy so that you've got some ideas already of what you do and do not like. As an example, after trying a friends guitar I realized that a full sized instrument bothered me so I looked for a smaller bodied one.