Right now I have 3 pins, a MAME arcade setup, Pool table, and Wii setup that is mostly used for Rock Band/Guitar Hero (Guitars, drums, mic) when some family friends over. When nobody around I'll hit a pin or the MAME machine. Rarely play the pool table except when my father or brother make a trip.
Really like having the pool table (it came with the house) but don't think it's a requirement.
Had a dartboard in the past but nobody (including me) really played, and it would need to be too close to the pins in current setup for my liking. Had an air hockey table in a past house that was only played when others over, but did get played hard.