Went there around 3 pm and found out it was closed even if it's supposed to be open at the time. There were people on the house beside the place so I asked about the kayak tours and they did not seem to understand.
I was about to leave but then one of the people I asked handed me a phone which I suppose was the owner and someone arrived in a few minutes.
Paid 250k VDN for a 1.5 hour kayak rental, it was supposed to be 2 hours but it was getting pretty late. A dry bag and life jacket were provided. It was a really nice experience, not advisable to do alone though(for safety reasons). But I still enjoyed it very much, i was the only one at the time in the waters, apart from 2 or 3 locals on coconut boats.