Get on the 'Net and hunt for cheap tours. Personally, I'd hit the museums and a lot of the 'culture' stuff.
But damn, couldn't you pick a nicer time of year. Shit, come to Florida. It's a nice 27C out today. The Stella is cold, the girls are hot and there are shitloads of things to do.
Uh-oh. Dinner is served. Be back later. Food first.