While thinking again, it appears one is fixated on a Tour Company to deliver a bespoke tour. However, for one’s part, the decision would be to take a private limo or a decent looking taxi from the terminal rank. Both options having the knowledge and contacts to deliver an excellent experience.
As a rule of thumb, budget for about €60 per hour, plus €100 for admissions and tips.
Then, allow up €1200 for top shelf Rhum from distilleries and/or Duty Free at cruise terminal, as there will be some very tempting gems to purchase. One’s tastebuds will be grateful.
If not flying home, consider rolling small a barrel of Rhum onboard.