I didn't read all the suggestions, but here are things friends and I have done.
1. Slumber party. I was the second to last of my high school friends to get married, so they were all out of the bar scene and had kids. We used to have slumber parties at my parents' house in high school, so we asked my parents if they would mind if we had one for my bachelorette party, and they were thrilled! We watched movies, ate junk food, played games, stayed up late, T.P'd a friend - it was a blast.
2. Great Wolf Lodge. Another friend of mine from work wasn't interested in going to bars either. She loves to go swimming but got married in February, so her sister thought it would be fun to get a suite at the Great Wolf Lodge and spend the night. We had a lot of fun swimming and enjoying being in a hotel (several of us were already married with kids).
3. At-home spa. We didn't have a lot of money to spend, so one of our friends offered to give the bride a pedicure, and we all did our own manicures. We swapped beauty secrets and played a Name the Heartthrob game. It was fun and inexpensive.