I've given up trying to drag em out, if they're the slam click brigade they wont exactly bring much to the party except encyclopeadic knowledge of macys, crate and barrel and cats. The ones that do come out are great but its sometimes difficult to get the critical mass.
Sightseeing etc i'm often alone but when the crew on the way back ask what you've done always a couple go "oh i'd have loved to do that"
The Temp crew on Worldwide LHR are a breath of fresh air, big range of ages and backgrounds but they all actually want to be there and are loving to opportunities that 80% of crew forgot existed.