I spent childhood summers on the South Carolina coast eating tuna sandwiches with my maternal family, sipping Fresca while the grownups sipped from Canadian beer cans sweating inside fluorescent coozies. I have fond memories of sunscreen, mysteriously persistent sunburns, salt-soaked bathing suits, toes reaching for sandbars, catching crabs in freshwater inlets, and searching for shells at low tide. Nevertheless, I’m no beach lover. Vacation destinations, as far as I’m concerned, should be temperate and ideally windy, cozy, even rainy. What can I say, I’m a cold weather enthusiast. Yet when a tropical coastline beckons, and the timing works out, only a fool would resist. So I found myself in Zanzibar on Nungwi Beach, at the island’s northern tip, slathering sunscreen, kicking sand, and marveling at breathtaking scenery. Blue hues dominate Nungwi, reminding me of another of my favorite destinations. The pace is slow, as it ought to be, and relaxation is the permanent modus operandi, a challenge for a stress-prone tourist trying desperately to wind down from a new gig. Fortunately I had some help in that department from my …