I am aboardÒ Apolonia, a 43-foot cabin cruiser, riding in Colonial Beach"s Riverfest boat parade. Riverfest is the town"s biggest do and it has been held annually since 1951, come hell or high waterò€”and believe me, they"ve had plenty of both. We have just pulled out into the Potomac from the shelter of Monroe Bay, which forms the town"s back door, and are working our way north, past Colonial Beach Yacht Center and Gum Bar Point and heading for the once and future municipal pier. To our starboard and stretching astern are the famous Kettle Bottom Shoalsò€”historically some of the richest oyster banks in the world. It"s about 1:30 in the afternoon and the June sky is overcast and threatening, but the Potomac is flat and happy, at least it feels that way in the comfort ofApolonia. Her owner, Paul Bolin, is at the wheel, easing us along the parade route in the number-two position, just behind the fleet commander and ahead of the rest of the pack.