If gardens are your thing, you can take a car to visit what I seem to remember is the King' mothers summer house.

To be honest, I remember reading somewhere that there is actually quite a lot to do in the local area. FS is very cagey, however, and doesn't put anything in your room telling you what is available should you choose to leave the complex. It is part of the 'stagey' nature of the place (which I loved, by the way) - ie they deliver you to the property by boat, when actually it is substantially quicker and easier to get there by car. There is no practical need for the boat ride at all.