The Water Museum - The Museum is free and is open from 10am-1pm, Mon-Fri. In the school holidays the museum is only open by request so you must go into the main building and ask the lady on the right for the 'musayo' man, a little chap will come and open up for you and tell you all about it all in pretty good English. If you parked at the waypoint, be careful as you leave, this is a one way street, so you'll have to go around the block.
The cache is not in the grounds of the museum as they close at night.
