One of the highlights of my trip to Mexico was being able to watch sea turtles mate. From Puerto Escondido, take a cab to Manzanillo beach (about 10 minutes, $3). We were approached by a vendor who basically charges people to go out on his boat for a few hours early in the morning to witness sea life. Not only did we see turtles, but we also saw dolphins, manta ray, and sea snakes. It was a rare experience since it´s only in July that the turtles mate. Fishing or boat excursions can cost from $20 to $50 depending on who you are, how much Spanish you speak, and who you bargain with. Get ready to haggle.
To the west of Puerto Escondido, on the way to Acapulco, and our favourite beach by far, found independently, is Playa Roca Blanca. Sign-posted through the roadside village of Cacalotepec (50kms from PE), this is glorious. White sands, palm-fringed, azure seas, cascading waves, stretching back towards the east, unbroken, for miles, rocky headland to the west, couple of palapas and DESERTED
Mid-way between Puerto Escondido and Puerto Angelo is Playa Agua Blanca (small dirt road the only access - but at least sign posted in both directions of approach). Here is a glorious stretch of beach and rocks which attracts predominantly local families fishing off the shoreline. There are no facilities whatsoever and looked too dangerous to go swimming - but perfect for the sunset!
Another of the glorious beaches along this stretch of coast, this has a number of basic rooms and comedores with one major hotel. Real hang-out for young surfers and gap-year.
SA is on the coastal road between Ventenilla and Puerto Angelo. Buses run frequently between Mazunte and Puerto Angelo, passing San Augustinillo.
Heading east out of Puerto Escondido towards Puerto Angel, just after the turn-off off Route 200 is Ventenilla - a glorious, almost deserted beach that is also the centre for trips to the lagoon that borders the beach (and crosses it in the wet season). Three or four cafes/palapas and the reserve's HQ are all that you will find here.
Access is along a dirt track (about 2 kms) just after the coastal turn off from the 200 paved road towards Puerto Angelo & Mazunte. Buses between PE & PA pass this way.
The stretch between Puerto Escondido and Puerto Angel to the east provides some beautiful coastal spots that are slowly becoming developed in a low-key way: at present they are mainly the hang-outs for surfers and gap-year tourists. There a few exceptions (Mazunte and its lovely beach, couple of hotels in the even more pictureque San Augustinillio) but generally the facilities are pretty basic - some of the beaches being at the end of dirt roads with no signposts.
Take a tour of the Manialtepec laguna, it is a beautifull lagoon with a lot of bird and wildlife and lot's of plants and flowers.
The hidden voayage eco tours (www.wincom.net/~pelewing/hvecotur.html) has good tours, you can choose between a few. Just take the one that will suit you.
Go and take the tour, you won't be dissapointed