What's the best excursions to take with little ones from 1-3 years old? Is it worth it to pay the extra $ and book an excursion or are you better off to take taxis? If you take a taxi, are the kids required to be in car seats? Someone said they rented a jeep and explored on his own. Is it pretty easy to rent a car once you get to the ports? And again do the kids need to be in car seats?