We just did this trip last week. The way yo do it, in my opinion, is to fly in in the morning, on the 8:30 TROPIC AIR flight, stay over in the park, and fly home the next afternoon on the 3:30 flight. We stayed at The Jungle Lodge, $70US, and had a great time. That way you can go into the park before dawn, and climb to the top of Temple IV to see the sun rise. It will be a highpoint of your life. You can pay a guide about $2 to take you. You'll get to hear Howler monkeys in the middle of the night. There are 2 other hotels, we liked this one. You must start trying to make reservations now though. You pay by check in advance to their Miami bank, then fax the cancelled check. Strictly up and up.