Oh and I don't know if its your thing- but its my sisters 18th in a few weeks and I have paid for her to go to a spa for a day with 3 friends. They get three treatments each and unlimited use of the pool/sauna and jacuzzi facilities. It was at my health center, and it was £60 for each of them- and that's in London and a top, top health center so I am sure you could find something cheaper if you fancy doing that? Or maybe look if there is a concert on you want to go too?