While walking, you will see much diversity: that is the beauty of Provincetown. The best thing to do is be open-minded about the odd art (most of which is stunning), homosexuals holding hands (get used to it), and odd clothing.
Homophobics beware! Though the Pilgrims touched land here first, there's very little Puritanical culture remaining. This is the home of artists, and the playground of the gay. If you have trouble dealing with homosexuals, I suggest visiting Chattem or Hyannis instead. It surprised me on my first visit, but have since learned to live with it.
Provincetown is full of Bed and Breakfasts !! You will need to get into one of them in order to stay in the town. Also an FYI -- Provincetown is a gay/lesbian mecca. So your in the right place if you like drag shows!! THEY'RE FABULOUS!!
There is this artist who build sculpture out of sand. A different one every day.
He does ask for a donation but the sculptures are brilliant.