Hotel is Moffat, as stated. Richard and Russ in the picture, and as said, Russ seems to have spent a lot of time in Scotland. The castle was used in Highlander, and should be revealed soon, I am sure. The waterfall may take a little longer!
Here is a picture at Eilean Donan Castle. Really good bunch of people, and a superb tour led by Russ, centre of shot.