We visited Puerto Jimenez, on the east side of the peninsula. Boated over from the mainland. Some friends had stayed on the Pacific side of Oso, primarily for the surfing. Hard to get to as the rain and Tico roads don't mix well in the area. Go in the dry if you drive, or fly in a small plane. Lightly settled/developed. So, fishing is probably pretty good, beaches are not too crowded, and life will be on Tico Time. The Oso does have a few more Jaguar and other native animals than much of the lowlands. For the real adventurer there is supposedly gold in some of them thar streams.