By some odd fortune, you now possess a bar. It's completely paid off and you have the capital to actually run it.
What kind of bar is it? Who do you want to attract? What's your unique selling point?
Note: It can't be called "Puzzles" and if you sell the bar, you'll get $5 in return.
I have two ways I can go with this. Since I've already discussed my idea of opening up a desi club in SF, I'll go the second route: It's a Cal alumni hangout.
Saturdays, it takes on the feel of a full sports bar, with the main tvs showing Cal games and the smaller tvs showing other games around the country. Patrons are encouraged to cheer loudly and be rowdy and for the big Cal football games, we invite one or two old yell leaders to get the people going. Oh, and unlike Pete's Tavern, we won't put other games on the big screens when there's a Cal game, no matter how much Notre Dame/Ohio State fans try to pay us.
On weeknights, it feels very much like Bears Lair. Games of beer pong in the patio and just general college-level merriment at night. It's open from 11 am as an oasis for any SF workers who want to skip out of work for an hour and just enjoy a beer. Don't worry, we have free mints so you don't go back to work smelling like alcohol.
Oh, and there's an open rooftop overlooking downtown SF. Because why not?