But a really cool, fun way to do it is call Henry - I'll find his contact info for you. He takes you in an airconditioned mini-van - private tour through Belize, stop whenever and wherever you want, drive through the border, stay at the hotel in Tikal, see all the sites etc and drive back to Belize at your leisure.
Get a driver or take a bus to Flores and then get on TAG airlines which has a commuter line to GUA. From there take a van for , I think, 20USD to Antigua. TAG is cheap if a little hard to get in contact with. You may have to call Flores airport and speak directly with the ticket agent, in Spanish. Good Luck
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