River Tubing in Grenada question

[San-D-Beach]

I need some help! I would like information on the river tubing excursion offered by NCL on the island of Grenada. I have been searching around and have posted on the Grenada board but have not found any answers. There is a private tour company called Adventure River Tubing (they also do Jeep tours) that go to the Balthazar River. Have heard good things about them but they are contracted through another ship that will be in port the same time...I have not heard back from them after several e-mail attempts. NCL would not give me any info on who runs the tour through them but it goes to the St. Francis River in St. Andrew's Parish. There must be someone out there who has done this excursion. I thought I might have the best luck looking on the NCL board. Has anyone done this excursion and is it worth the $59.00? What company runs this?

Thanks for any help you can send my way!