We visited the amazing Falkirk Wheel last October (2008) in terrible rainstorms, but it was a great day out nevertheless once we were indoors! The cafe was very pleasant, the gift shop full of interesting things, and the one-hour long "Falkirk Wheel Experience" was in an enclosed boat (thank goodness). All the staff were friendly and extremely well informed and there was an excellent commentary explaining the history and construction of this magnificent feat of engineering.
A model of the wheel inside a glass case in the shop