Hi everyone! (again)

Considering I am travelling with a local who has a vehicle I'm not going to be booking tours but rather just driving to them myself and paying when I get there. I was wondering has anyone done this ? Does anyone know how much it is per person if you just show up to the Appleton Rum Estate for a tour without a tour group? Also the same question to get a trip down the Black River ? I know that there are people on either side of the river that we can just walk up to but does anyone know how much it is?

Thanks for the help!!