I've had two interested parties. We'll be in a Cessna 182, so we'll still be comfortable with full fuel. Both are pilots too, which means I won't have to do all the flying.
The boat is on a charity trip around the British Isles in 6 days, doing an average of 8 to 10 hours a day, not including stops. Apparently it can make 40knots in reasonable conditions. It's a shame it won't do 65 because then we could just fly along above it! If the weather is good it should be a fun day out.