We are planning on staying at the San Antonia Marriott Rivercenter while in SA for our son's AF graduation. What would be the best and most economical means of travel to the base and back? We were under the impression he would have the weekend free, so we only thought we would need a car for 1-2 days but after reading the reviews, it looks like he will have to be back on base nightly. A taxi twice a day seems pricey but so does the $25-33/day parking at the hotel in addition to car rental. Are there any other forms of travel to the base that might be more economical? If not, what would be a more economical place to park in close proximity to the hotel?