I like to watch the birds. We have a feeder on our back porch and I will often write down the birds that visit us and enter them on eBird.org. It's fun in a number of ways. First, because they keep a list of all the species of birds I've entered; I've seen 33 species to date:
Great Blue Heron
Norther Flicker (also a woodpecker)
Tree Swallow (observed with my brother!)
Brown Creeper (they walk down the trees)
Cedar Waxwing (they started me in birdwatching)
Dark-eyed Junco ("snow birds")
Northern Cardinal (we had a pair in our yard all summer)
Red-winged Blackbird (they have my favorite call)
House Finch (several pairs live in the tree behind the garage)
I would have no idea that there were so many birds that I've seen if I hadn't been telling eBird about them. Matter of fact, I wouldn't know the names of several of those birds had I not been watching and reporting. Other cool facts that I have learned, looking at the data summaries they give:
I have seen 19 species in my yard.
I submitted 108 checklists last year listing birds seen at 12 locations.
94 of those checklists were for birds seen at my house.
I saw 889 birds (well, since so many of them were seen at my house, there are likely a lot of repeat visitors, but there's really no way to tell for sure that I know of.)
Also, thus far this month I am the only person our county to report any birds to eBird.
The really cool thing? Real Scientists may use my data: they do that at eBird. You ought to check it out!