Tropical Fish
I've had several interests over the years, at one time not long ago, I had 19 aquariums set up in my house, but that got to be a chore trying to take care of so many precious life forms, I had to cut back on that number for their sake.
Bowling
I've been bowling now for about 15 years and I still enjoy it today, although, my average has peaked and now seems to be on a downward spiral, it's still a lot of fun and I don't have any plans to quit.
BassFishing
Fishing for bass is probably the hobby that I would find it difficult to quit completely. It gives you so much for such little effort.
Music
Learning to play guitar, this is a lot of fun and deffinately challenging.