If you appreciate rock formations and lagoons, El Nido in Palawan is a place worth your attention.
The first and very important tip I've learned is to avoid going in the month of December. It gets really packed to the point it won't be enjoyable as you'd have to line up to get into lagoons when island hopping.
Second, no matter how tempting it is to get the speed boat or modern-looking boats when island hopping, opt for the local boats called "bangka" that have outriggers that balance the boat. This will save you from nausea and seasickness as it's more stable for El Nido waves.
Third, if you want to visit a relatively virgin beach, stay in Nacpan Beach, which uniquely has luscious dark brown sand.
Lastly, bring a waterproof case or jacket for your phone. And, have fun!