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Probably not a concern for the op's friends but several hotels along the river are posted 30:06. The room rate is high but they also charge $20+/day for parking

Probably out of date, but when I would lay over in SA with Delta Air Lines, we would stay at the Crockett Hotel across the street from the Alamo. I would eat on the river at Rio Rio Mexican Food or The County Line barbecue. Both were good back then.