The boat goes from POR-FQ-DTD.
So going between the two resorts, there is no stop.
Boats go about every 20 minutes. The only negative is at FQ you kinda stand in the sun and heat. I think there were maybe a few unbrellas that didnt do much. The wait at POR is nicer as you have a dock right up by the buildings. so you can walk about and see the boats come in.
For those going from FQ to POR to swim, this is my tip and what we did. This is based on if you have alot of heat:
The pool at FQ is basically right on the river. You can go there first and when you notice a boat is coming from DTD, you know it's about 20 min until the next one. When I saw the boat coming/leaving this is when I told my kids to got out of the pool, dry a bit, gather our thing, throw on our coverups( I think there is a shirt-shoe rule on the boat). Then by time this was done, the next boat was on it's way. We loved switching pools like this.