Hope you let guest rel and excursion dept know..not so much for a credit but to have them square things away with the vendor,
We had a simlar experience on St Kitts..long trek in hot sun to board an obviously too small ferry...then we were asked to get off..long wait in the sun for a larger vessel..No one from Celeb excursiin dept in sight..at least to hand out water! Dropped off at same inconvenient spit...had to take a ling trek thru shops.
Our ferry ride and tour on Nevis were great, but X excursion Dept was useless!