You'll find tire-company recommendations for rotation that range from every 3,000 miles to 15,000 miles. The best interval is probably somewhere in between, at about 7,500 miles, unless the tread on one or more of your tires is wearing differently from the rest. Michelin, for instance, suggests rotating tires every 6,000 to 8,000 miles. I won't re-balance a tire unless I notice odd wear patterns or, as you mention, feel a vibration.
The Tides is directly on the beach. The Tides at Tops'l exemplifies the finest in elegant resort living directly on the Gulf of Mexico. Enjoy the majestic views from this spacious two bedroom condominium. To make your visit more memorable, enjoy the many amenities at The Tides including a jacuzzi, large sundeck, heated bi-level outdoor pool, kiddie pool and game room.
Schematic of the lunar portion of earth's tides showing (exaggerated) high tides at the sublunar and antipodal points for the hypothetical case of an ocean of constant depth with no land. There would also be smaller, superimposed bulges on the sides facing toward and away from the sun. In Maine (U.S.) low tide occurs roughly at moonrise and high tide with a high moon, corresponding to the simple gravity model of two tidal bulges; at most places however, moon and tides have a phase shift.