Two days in Puerto Escondido, what to do

So my girlfriend and I pretty much have our basic itinerary set in stone. And we'll be staying in PE for two days during our trip coming up soon. Arriving midday the first day and leaving around midday the third. We are definitely whelmed with all the things we would like to do while we're there.

The bioluminescent lagoons were definitely a must before, but I've heard the closer one, Manialtepec, isn't as good as the further one Lagunas Chacahua. But those would be a whole day trip I think. And we'd also like to try a surf lesson since we haven't surfed before. Also considering either the turtle release on playa Bacocho, or whale/turtle/dolphin viewing boat trip depending on how it's like this time of year. We of course would like time to relax and enjoy the beach and eat plenty of food as well.

Obviously we can't do all these things given the time there. But which would be good to pick if we could only do two or maybe even just one?