I've passed the Pacific Heritage Museum many times walking to work, and one day I decided to pop in for a look. What a surprise! First of all, the admission is FREE! Second of all, they currently have absolutely beautiful paintings (mostly watercolors) by several Chinese masters, both in the traditional style and modern style. One of the artists' works look very much like Modigliani's. All the pieces in the show are form a private collector and will most likely not be seen anywhere else. The show is up till June, but don't miss it--be sure to add this on to one of your museum visit days! Hours are 10-4 Mon-Fri.
Pros: FREE Admission, high-quality exhibit
Cons: parking (take muni)