Luxury cruise lines have been racing to offer more upscale experiences, but few carry price tags like the Ritz-Carlton. In late March, my mom and I booked a $35,000-per-person, 10-night sailing through southern Japan aboard Luminara, the newest ship from Ritz-Carlton Yacht Collection. Timing played a huge role in our booking choice, as visiting Japan during cherry-blossom season is a bucket-list trip my mother had long hoped to take. Round-trip from Tokyo, the itinerary included stops in Osaka,