We were in El Nido for 5 days. and this was our last tour, Tour B.
Entalula Island was our last destination. It was beautiful, as how the rest of the islands of El Nido are. Peaceful, serene waters, beautiful marine creatures, a family of clown fish (oh yes, we call them NEMO!) Very nice spot for snorkeling.
Since the stay in the island is just 40mins to an hour, you have to inhale all the beauty very quickly ;)
If you want to stay longer in there, there is an exclusive resort (I think it's El Nido Beach Club) that has a portion of the island only for their guests. No idea on the price. But an hour is okay if you are on budget. Anyway, island tours will give you other good views of the El Nido paradise.