I finished off the rest of the tags in San Andreas tonight, giving me a set of weapons back at the house, and then figured I should make a bit of money. Fortunately this is trivially easy in SA thanks to the betting parlor. With some save game abuse, I soon had over $5 million, and went around and bought up all the safe houses I could.
Next up I should probably collect the pearls that I can, and then maybe do some of the side missions like the burglaries or pimping (both also new to SA).