It's too bad there aren't any places close enough for you to take a few lessons. Just in case here are a couple links to agility clubs in Ohio. Maybe one of them is close enough that your parents wouldn't mind driving you to it once a week.

http://www.usdaa.com/groups.htm#Midwest

http://www.nadac.com/NADAC_Clublist_by_zip_code.htm

Here is a link to some homemade agility equipment plans. If you decide to do this just for fun then it would be worthwile to buy a book or two to see how to teach the equipment properly. Remember not to do too much high jumping or climbing as he is still just a pup and you don't want to stress his growing bones and joints.
http://www.dog-play.com/agility/agilitye.html

Another fun thing to do is trick training. Teaching him tricks would also be helpful for if you do get him into therapy work. He could show off for the seniors You're only limitation with tricks is your imagination. But to start you off here is a link to many different tricks you can teach.
http://www.uwsp.edu/psych/dog/lib-SpecTrain.htm#trick

And of course there's my personal favorite, obedience which is a great way to bond with your dog. If you wanted to compete with him then it might be a little hard to do all on your own, but here's a link to see what it's all about.

http://www.akc.org/dic/events/obedience/

Whatever you decide remember to have fun.