Isla del sol is a condo development that provides rentals through various agencies. We ended up here because we couldn't find a large affordable place on the beach. Physically the unit and grounds were very nice and well kept, and the rental agency seemed appreciative of my suggestions when we checked out. Just beware of the strictness of the "pool police."
We stayed here in 1992 when our kids were toddlers and vowed never to return because of the grief we got. We came back last year and found things pretty much the same. That being said, if you follow the rules (no towels on the balcony, keep your pool chairs out of the walkways, no toys in the pool, and no one under 14 in the hot tub etc.) I think it is a great, quiet, affordable place to stay. And, yes, we booked the same unit for this year's spring break.
Isla del sol is not on the beach. A short drive gets you to Pass-a-Grill beach which is rarely crowded. Parking is convenient and there is a basketball court across the street which my son used every day.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.