Swiss Family Robinson?

My husband recently got a days out/holiday voucher to mark 25 years service with his company.

I'm really excited as we're going to stay in a treehouse in Wales next Easter. It's in an absolutely beautiful area (well, isn't most of Wales just stunning?) and it's only 20 minutes from the Centre for Alternative Technology, which I've wanted to visit for a long time (and it'll be a good bit of 'Continuing Professional Development' to put in my PGCE portfolio as well!).

Slightly worried about the 'outside shower' and 'optional clothes', though. Wouldn't be surprised if Ant and Dec turn up... Could be a whole new reality show - I'm a teacher, get me out of here!