Karen and Catsnclay have some good ideas you should follow. MrSpunky my 12 year old earned his name. He is still a punk but has finally chilled out some. Play, play, play. Get a cat tree or two. Sprinkle cat nip on it to attract him. Change out the toys because they get bored. The laser light is a lot of fun and doesn't tire you out.

Bath Tub hockey is great. I had a cat years back that would skate in the bathtub - no toys needed. Go figure.

Some cats are biters. Spunky is. I've never broken him of the habit. I just found other things to interest him. He does educate me.

Good luck.