Great Race excursion in St Maarten

Any reviews on Great race excursion either Through RCI or Tri-sport eco tours? RCI is only about $10 more pp but wondering if it will be a smaller group with private company. I did post this on port board but only got a couple of responses.

We booked the excursion thru RCI on a cruise last year in st Maarten , but it was run by the tri-sport guys. They were great, we had a lot of fun.

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