You will not be allowed to visit pools other than the ones at the resort where you are staying. You're likely to get a lot of comments here that the Contemporary pool is not great, and I agree, it's dull in comparison to the theming at some of the other resorts. BUT, a four-year-old will not care about the theming as much as the fact that there is a slide (a pretty good one at Contemporary) and water. The benefit of the Contemporary pool is you can see the whole thing at one time making it easy to keep an eye on a 4YO. So, if you're "stuck" at the Contemporary, don't worry, your 4YO will still enjoy the day at the pool.