If I reserved for 8, but there’s only 5 in my vehicle…do I still need to pay for 8? Or only the 5 that are coming to Hamilton Pool?

They charge a reservation fee per car and then at the entrance per person, so no, I don't think they will charge you if there aren't this many people. Cash only tho.

The prepaid online reservation is for the reservation itself and that's per car (up to 8 guests). When you're there you pay a cash entry fee per person regardless of how many you said you'd bring. I said I'd bring 4 but we were only 2 so we paid for 2.