Given what I enjoy doing, I'd go with a rifle and a shotgun. As of now, I can't conceal carry. If I could that might change things.
For the rifle, it would be a 336 Marlin lever action in 30-30. It's just my favorite and for my hunting, social plinking, and emergency defense needs it would be good enough. It would be a precross bolt safety with a 16.5" barrel.
For the shotgun I'd be torn between a good old Mossberg 500 with two different barrels and wood furniture vs. a nice double shotgun. I would probably cave in and get the good double shotgun. Again, it would work nicely for clays, range plinking, and emergency defense.
Should I ever get a conceal carry permit, it would likely be a Glock 30SF (or two or three of them). It's not my favorite pistol but the best compromise of all the things I'd want to do with it.
After that I would add a 22 LR rifle. If I can have only one, it would be a nice one. Likely a lever action 22 of some kind.