Day spa! A lot of places do packages for "girls days".

Or salsa classes?

A cooking class?

A painting class? (a friend had a life model class for her Hens night)

For my 30th we went away for 5 days to visit my bestie and we all went out to a nice restaurant for dinner - in a bit over parties. Although I had toyed with a cruise on the Yarra with a few friends.