We arrived at Poas Volcano on our 1st day. Our flight arrived at SJO at 630am, so we had plenty of time to get to Poas Volcano National Park. We had a private driver booked in advance (for 10 day - check out my review on the driver, Danny Jimenez). You must book the entrance fee in advance because the parking attendant will ask for the barcode before you are allowed to enter. Because we got there early in the morning (around 830a) before the clouds roll over, we were blessed with a great view of the crater. You must be able to walk up to the crater for about 1/4 mile and some stairs to get to the lookout.