Whirlwind half-day tours to Isla del Sol are strictly for the been-there-done-that crowd as the island definitely merits a night or two. That said, the majority of the ruins and associated sights are located on the island's northern half, which is off-limits to tourists. In the limited area you're allowed to roam you'll find a few small ruins, lookouts and walking trails, but most visitors simply kick back and enjoy the view.