Bar Serving Alcohol to 19 & 20 Year Olds

I am looking for a bar within walking distance from the cruise ship. The vessel will be in port until 4:00pm. Is there a place that has reasonable liquor prices, one in which me and my two daughters will feel safe that would fit the bill? Oh and of course one that will serve alcohol to 19 & 20 year olds? Thanks in advance.

Lots of bars walking distance, the drinking age is 18 so shouldn't be a problem