One of the beauties of Puerto Princesa is their people!
We arrived at night to PP where you also did couchsurfing, so our friend hosted us. We reached his house where he was also hosting a couple from Argentina and turkey. It was a surprise for me because I didn't expect it. First night we spent talking about our life's and planing about the next day.
We woke up early in the morning, we took a tuk-tuk to one corner in the center where we took another bus to Honda Bay. There, you can rent a boat by yourself or share with people to reduce the price, because they rent the boat as a total price doesn't matter how many you are. That was that we did, we share the boat with a family, one girl of our age and her parents.
I have to mention that we have different tours to choose there. We chose the most common, that includes three islands. It was recommended by our local friend. Before enter in the boat, we bought bread because it's the only way to see fishes when you are doing snorkel. First stop was snorkel. We stopped in an island and our guide help us to do it, so don't feel scared of doing it. In that island, we also saw starfish and instead we moved to the next island where we had lunch and swimming for a while. Last stop was in a beautiful island with white sand and blue water where we spent the rest of the half day.
Second day, we visited a lonely beach named Monkey Beach, we paid the entrance and we spent the whole day there almost alone. The sand is not white as other beaches but we find there a beautiful peace. Just around us we saw some kids playing but not tourists.
We enjoyed the lovely sunset and we came back to our house's friend to prepare ourself to go out for dinner. We had dinner in the Port where you will find a lot of options and prices. There you have also a handmade fair where you can buy a lot different stuff, souvenir, etc. Even you can get tatoos there. It was a surprise for everbody.
Next day we prepare to ride motorbike to a new beach, Nagtabon. It was a little far from our house's friend but we really enjoyed the beauty and incredible landscape before we reach the beach. This beach was different with different options of food. We spent the whole day there with friends and we play volleyball in the local people there. It was a really enjoyable day. At night, we went out to karaoke, normal way to enjoy with friend in Asia.
I could not visit the underground river but I have the information and also the contacts there if you want more information!
Best Luck! I hope you like this.