I'm going to give my avatar a make over then pimp out my apartment.
try a game of bowling and try to win a HomeBowling trophy.
hang out in a game lounge like MotorStorm (if there will be one) and hookup with someone interested in racing online. Then afterwards chat about the game and get some tips and tricks from the pros.
head over to the movie theater to catch a movie or explore other themed lounges.
occasionaly host a party at my apartment. Every Friday will be movie night and Saturdays I'll have special event for friends. Mostly, leave the weekday to gaming and hookup with other gamers in Home and party at my Home or someone else Home on the weekends.
Wow hearing all this gets me excited! Btw, they've already confirmed you can have 16-person parties in your own apartment, and that if there are bigger/official/game-related parties, they will make "party rooms" that can hold more people.