We love Cedars, California Pizza(inexpensive and yummy), and don't forget the buffet which is great for the money! We almost always have room service for breakfast. Also look at the restaurants to see where you might want to eat. There is a people mover to make the walk a little easier. It has a small gambling floor in comparison to the rest of Foxwoods. All the hotels have great rooms, but Fox Tower was built last and is the farthest away from the main casino. I think Fox Tower only has an outside pool, but a really nice one for summer. I love the window seats in the Great Cedars. The pool at the Great Cedars is small and needs better lighting.
If you plan to use the Spa and Pool I would suggest the Grand Pequot since it is easily accessible from your room. If it is your first time staying at Foxwoods you might want to consider a couple of things.