We've taken the AI in Los Cabos, Puerto Vallarta and Playa del Carmen because we're not going to take a taxi into downtown for every dinner. My home base in Cabo is AI optional, but doesn't allow any transactions such as a cup of coffee, a water bottle, or a single meal. That would leave us to walking next door to the neighboring resort, gaining nothing. Some resorts in these areas may be a $40 taxi to downtown. We also stayed at an AI optional in los Cabos. When you look at the menu prices for the cash payers, they are inflated so much that it is much better to just take the AI even if you go in town for dinner once n awhile. We're not big drinkers either. Even with kids age 12-18, they have to pay adult prices and have plenty of soft drinks. And no, I don't really want a rental car in Mexico as it brings other undesirable risks to the trip.