I have always had plenty of hobbies, but grad school really took all the fun out of life and drained my life force so I haven't been into things as much as before but am starting to trickle back as time goes on.
Guitar - Played in a few bands and was pretty good at one point. But I probably only picked up a guitar a few times over the last 3 or 4 years and have gotten really rusty. I have started playing a little more as the kids seem to like it and I did get the 4 year old his own to sing and play along with me. But something is really wrong when you go from playing along with the entire Randy Rhodes tribute album to barely being able to keep up with Nirvana.....
Photography - I still do this quite often when I get out field herping or just shooting the kids. This seems like one that you never really lose once you get it. I have not been as serious as before and don't have a darkroom set up anymore, or go on photo only excursions, but then again the kids take up a lot of that time.
Hiking, camping, field herping, fishing, birding, wildflower and plant ID, general outdoors - When I get the time and find someone else to go with. I field herp alone a lot, but there is snow on the ground as I type so..... This stuff will pick up soon anyway.
Sports - Yes, I am getting older and golf, but still play football and hockey when we can get enough old gezzers out. I am a football nut and am already scouting for next years fantasy football draft and keeping up with draft day talk and who will go 1st round and who the Steelers are aiming for.
Gardening - Not vegetables so much as flowers and landscape plantings. I like to have life around and this is my way of attracting wildlife around the house. I plant for birds and bugs and love to have my morning coffee in the garden.
Anymore though a lot of these have taken a back seat to spending time watching the kids play. But that's a pretty good hobby in itself. They are only 2 and 4 once and the other stuff will still be around later.