The pickup time is actually 6:30 am even though the listing on TripAdvisor currently says 9:30 am. We got an email at 7am to day our tour was cancelled because of a no-show and when we contacted the local agents who organised the tour and sent us the email we were told the booking through TripAdvisor is actually made via a tour operator so we had to contact them. The tour operator informed us that the 9:30 tour only operates if the 6:30 am one is full which isn’t clear at all from the info above. I’ve attached a screenshot of the schedule notification via TripAdvisor for our booking below.
We eventually arranged for our tour to go ahead at 9:30 am but both felt like we were rushed through as we were the only ones going at that time.
Honestly I’d skip this activity if I were doing it all again, there’s several better options to do in the La Fortuna/Arenal area.