Bahia Rincon is the quiet, sheltered bay at the head of Golfo Dulce. The jungle encloses the bay on all sides. We saw all kinds of birds, that we can't identify. It rained steadily the two days before we arrived and the first two days of our stay, so the water was murky so we neither swam nor explored the nearby snorkeling.
Be cautious as you approach as Punta Rincon has a shoal less than 2 m extending perhaps a 1/4 km ENE from its tip that is not depicted on the charts that we have. The bay itself is mostly 20-25m depth. In the extreme SW corner anchorage can be taken in 10m about 25m from shore. I wonder if there enough depth in our entire swinging circle at low tide, but as we haven't had wind to speak of in a long time we took our chances. More prudent vessels would anchor further from shore in 15-20m. The bottom is mud, and the anchorage is perfectly flat, troubled by neither swell nor wind.
The road to Puerto Jimenez runs along shore, but it is hidden from view by the jungle and has little traffic. The town of Rincon isn't visible from the anchorage, nor is it clear in which direction it lies. There is some settlement along the road, but the area is rural. We stayed five days but did not go to shore as there didn't seem to be any attraction.