We haven't stayed there yet (actually thinking about going this summer), but it looks very nice. Reunion is a large, diverse resort with many kinds of accommodations, including private homes, hotels, condos, and timeshare condos.
The Wyndham timeshare units are all 3 bedroom (K, K, 2 doubles) - 3 bath. Those units are 1530 square feet and have a full, well-appointed kitchen.
There is golf at Reunion and also a large waterpark. Depending on where you are staying and how you booked, you may or may not have access to the waterpark. If your parents booked with Wyndham points, you should have full waterpark access for the entire length of your stay.
According to Google Maps, Wyndham Reunion to MK is +/- 20 minutes by car. To put that in perspective, if you're staying at Disney's OKW or SSR, the drive time is about 10 minutes -- longer if you're staying at one of the value resorts. The other theme parks and Disney waterparks are closer. Downtown Celebration (site of numerous nice restaurants) is a little less than 20 minutes away.