Dear Ageless Traveler, I am about to take a six-week trip, and it's never easy to plan. But after visiting 140 countries, I do have some hints and tips. I also have a roster of places I've found worth the effort of long-term travel. In an earlier newsletter, I reported on how we Ageless Travelers are taking Gap Years, where we travel for months at a time. My trip is taking me to the Galápagos with GoGalapagos, the Ecuadorian Amazon, and barging through the Champagne Valley in France with...