Pretty sure you need to book so I would definitely do that in advance.
I wouldn't book through the resort as they may or may not add commission on. Call the company SUP yourselves and book. The bus is a simple way to get there.
Sorry but not sure of the prices.
Normally the resorts/tour reps do not add on a commission - the price is usually structured so that if a rep or hotel make the booking they get a commission.
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