The most popular outdoor activity in San Juan Del Sur is surfing. We have a big surfing culture that revolves around San Juan Del Sur and its beaches. We get a lot of offshore winds, which is preferable for surfing. So surfing is the number outdoor activity here.
The second most popular outdoor activity would be sports fishing. You can catch marlin, sailfish, mahi mahi, etc
Recently, mountain biking became popular, too. There are mountain biking races every so often.