East Williston does not have their own pool however most East Williston residents join the Williston Park pool and its located off Willis Ave. between Hillside Ave and IU Willets Rd. The Wheatley Hills Golf club is a private club with a golf course and dining, they do not have a pool.
In addition to the information you can find at http://www.eastwilliston.org there is also the Roslyn Country Club pool that has been purchased by the Town of North Hempstead and should be in full operation this coming summer. This pool club, located in the residential neighborhood of Roslyn Country Club, should be accepting members for a fee once it is operational.
Andrea, East Williston does not have a pool club but many join the Williston Park pool for a fee. Usually opens mid June and closes Labor Day. Families that like to swim year round can join the Tully Park Indoor pool run by the Town of North Hempstead. Feel free to check out my website at http://www.laffey.com/spiscopia.