Ft. Myers, FL is the closest airport to Naples and code is RSW.
Miami, FL is the best airport for interntional competitors to fly into and its airport code is MIA.
It takes about 45 minutes to get to the race site from the Ft Myers airport and about 2 hours from Miami's airport.
The Naples Bay Water Shuttle is a great way to traverse the popular shopping/dining districts of Tin City, Bayfront, Naples Bay Resort and Naples City Dock. It only costs 5 bucks to ride and you can get on and off at any point of the ride.