Our 3 kids started doing the taxi-to-municipal route, starting at 2 years of age. Advice I would give: make sure the car has air conditioning and request to use it; if there is any indication of motion sickness, give medication beforehand; if you have time, get a drink at the municipal airport cafe (if not motion sick-wouldn't make for a good flight over-just sit in the air conditioned office). The food at the cafe is great, too, but at least get them a drink and let them stretch their legs. The ride from international to municipal is usually very easy, but it can be hard to get used to the tropical climate at first. The car may not have the best shocks, and the roads can be bumpy, but the traffic usually isn't bad, and it is a quick ride. If you chat up the driver, he will usually give you a short history lesson on the way, or tell you what has been going on lately, how the fish have been biting, what that building is, etc. Email me if you need more info.