Sierpe is a little town on the river, with a small marina. We were told this was a must-do, in order to get to Drake's Bay. So glad we did it. We left Uvita, and took a bus to Palmar Norte, then a cab to Sierpe. While waiting for our 3:00 boat, we saw a huge crocodile cruising through the river eating fish. The boat ride from Sierpe to Drake is quite unbelievable. It only takes about an hour, and you race through the wide river, then into narrow mangrove passages, then the boat jets out into the river mouth, dodging waves, until out in the open Pacific ocean. We were then dropped off right on the shore of Bahia Drake, where everything is close by. Highly recommend it!