“Low-key” sums up the Napili Kai Beach Resort (808/669-6271 or Napilikai.com) and other quiet condo resorts that perch above the sand. Bonuses: great sunsets and a cove full of turtles. Sanibel Island, Florida: Absolutely the best shell. 9/27/2017 at 5:35 p.m. Why to Visit Durham, North Carolina. 8/30/2017 at 5:59 p.m. The Outer Banks Are a Perfect Year-Round Beach Destination A guide to the 130 miles of beaches, the vacation-house…