I think you are actually referring to either Royal Palms, Sabal Palms or Imperial Palms. There is no Cypress Palms in the Marriott timeshare family. All three of the Palms properties on on the World Center property. Sabal Palms is within reasonable walking distance to the World Center hotel complex and pools while Royal and Imperial are a little more removed and would likely require a shuttle ride. All three have free access to the pools, amenities and slide tower at the World Center.
Harbour Lake would be pretty good choice for the OP given the age of the children. It has pools geared toward kids. Grande Vista would probably be a good second choice. One problem with Harbour Lake is only a queen bed in the second bedroom with a pull out sofa in the second room and living room. When that sofa bed is pulled out in the second bedroom, it makes for very little room. I would personally opt for Harbour Lake since you have a good chance of getting a 2BR unit that has two queen beds in the second bedroom. Most 2BR units at Grande Vista are lock off type units with a king in the second bedroom. If the OP can score a 3BR at any Marriott property in Orlando, it would be ideal. Imperial Palms is a good choice because all of the units have 3BR units and if the OP is using Marriott Destinations Club Points to book, the points cost is the same as the 2BR units at Royal and Sabal Palms.