A tiny little place on Centerline Road (just pull over by the side), my teens loved the smoothies here. We stopped three times during the week we were at Maho. We recommend the St.John's Special (banana, mango, passion fruit, coconut and sour sop - a native fruit) and the Funky Monkey (for adults). Expect to pay between 7 and 9 dollars for one smoothie, but like everything else on St.Johns, expect to pay more than you bargained for. But after a day at the beach, swimming and snorkeling, these smoothies sure do hit the spot. Plus, these were much better than the smoothies we had at Bordeaux Mountain and frankly, there aren't a whole lot of other options.
I also agree that the service is lackadaisical, with seemingly jaded helpers seeming done with serving the steady stream North American visitors to this beautiful island. But, then again, this attitude seemed pervasive: its as if the servers (mostly white North American ex-pats or recent college grads) resented having to serve us, their visitors. Very perplexing reception, for sure.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.