We did the Family Recreation Plan last summer, and it was great! We stayed at VWL, myself, DH, and 16-year-old DD and a friend. The girls loved the water mice and took them out practically every day. DH and I enjoyed them, too, as well as the mountain bikes. We had unlimited use of the water mice, pontoon boats, and mountain bikes for the ten days we were there. Because of the high use volume, they asked us to return the mice after an hour's use in case someone was waiting for one. Sometimes, we had to turn them in, sometimes we didn't. If we did turn in our mouse, we could usually go back out on the water within 20 minutes.
This is a fabulous way to go. On days we didn't do the parks, we'd flop around the room for awhile in the a.m., have breakfast, take a bike ride or go out on the water, spend some time at the pool, go out on the mice, and in general relax and enjoy the resort. I loved being able to slowly cruise past the Magic Kingdom, the other hotels, and the former Discovery Island. *sigh* July won't get here soon enough!