We went for a couple of hours and ended up spending more than half a day here. Lots of interest for all ages (we had 3 generations to entertain) and it's useful to remember that there is an indoor play area to fall back on if you get caught out with the weather. Excellent cafe. On the more expensive side, but you can buy a ticket to the grounds only if you just want to go for lunch/ walk. Worth looking in on the real tennis court as people still play.