Yes! We did it in September and all of his tours are private, so just your group/family. Jerry picked us up at the port in a nice van. We drove to the rainforest, stopping once for a photo up on the mountain. Once there, we were joined by the dogs (the land owners have 4 dogs that LOVE to "guide" you up the trails) and began our hike. This hike is all private property, so you will likely be the only people in that area for miles! It's super rugged! It's literally through a trail he created with a friend, over trees, under trees, rock ledges, etc. My 5yo twins handled it like champs, so it's very doable! Jerry was also super helpful with them!
There's a small cascade that we hiked by. Then the waterfall pictured was the one we decided to stay in. There's a MUCH larger one another 15 minutes up the trail that's rather spectacular, but we didn't go to it as we thought it might be a bit much for our children and it was crazy hot/humid that day. We had all the time we wanted to swim, climb, and explore.
Once done, we hiked back down and went to a restaurant for locals where we had quite the local feast for about $60 (for the 4 of us including dessert). The day was truly magic! Jerry is an amazing host and we will always use him when we return to San Juan.
Of note is that we wore swimsuits under hiking clothes (Columbia zip off pants and shirts) and kid wore swimsuits with rash guards and shorts (for the girl). Husband hiked in old tennis shoes. I wore my Keens with socks (which is what Jerry wears). Kids wore Natives with socks. While in the water, we kept our socks on for "grips" in the algae. When we got back to the boat, we trashed them! I'd bring an old pair for the water and a dry pair for coming back down!
Hope this helps!