We just had the best time! Our tour guide Terii was knowledgeable about the plants, animals, geography/geology, and Hawaiian history. We are hikers, not bikers, and we came prepared with proper hiking shoes and our trekking poles. What we couldn’t have predicted was the sudden rain (but hey, it’s a rainforest!), but Terii had ponchos! It was advertised as pickup at 9, 4 hours, and we had booked Iolani Palace for 2:45, so Terii made sure we were back by 1. Too bad, though, because he was prepared with snacks and was willing to go farther. The terrain was moderate and we (in our 70s) had no problems. Gorgeous views. Definitely recommend it!