It's been a while since we've been to a casino in San Juan, and it wasn't the El San Juan, but then (maybe 10 years ago), dress in the casinos in San Juan was MUCH better than any other place we have been in the Caribbean. The locals were dressed to the nines. Eric wore long pants, for sure. Not sure whether they would refuse entry to someone in shorts and flip flops, etc., but, as of when we were there anyway, you would definitely look out of place.
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