When I lived in Puerto Rico, my parents visited and I took them to the Bacardi Plant. (I actually lived about 8 mins. from the plant.)
It was nice...relaxing. I thought the history given on the tour was interesting. We rode a tram around the plant, except in areas where you needed to go by foot (inside the plant). As another post mentioned, you are able to purchase Bacardi products that are not available in the US. I recommend the Bacardi Reserve in a black label...quite nice. Plus, you get to sip rum drinks on a big patio with the Atlantic Ocean in view and a tropical breeze in the air. The drinks varied...rum punch, rum lemonade, rum and coke, etc. For me it was the first time I'd actually had a drink with my parents...didn't know my mom was a rum fan. I have a great photo of my parents cozied up to a 10 ft. tall Bacardi Rum bottle which is one of my favorite shots of them.
Since I lived there when I went, I can't help with the taxi question...sorry.
Laura ºoº