El Nido is without a doubt one of the most beautiful places I have ever been. Near the north end of the island of Palawan, the surrounding limestone cliffs make you think you may be entering an area like Jurassic Park.
One of the most popular attractions is island hopping. Each operator offers the same tours, typically visiting 5 different islands and/or lagoons.
Depending if you're looking for more beach time, or diving, there are tours to suit everyone. I opted for Tour A, on a recommendation from the hostel. I don't think you could go wrong with any tour you picked though.