Where is the Poker Run? River, small lake, big lake, open water?
What organization is putting the PR on? The FPBC runs typically have the boats broken down into speed brackets so that most everyone in that bracket can run together.
Typically, if the body of water and the weather conditions allow, you can "run watcha brung". And, as long as you are back at the dock in time to turn in your cards, it doesn't matter how fast you run.
Remember, a Poker Run is not a race!!!