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"Sailing the Rhine, Main, and Danube on Viking's Grand European Tour from Amsterdam to Budapest provides a relaxed, culturally rich river-cruise experience with stops in charming towns and major European capitals — a solid choice for singles in their 50s seeking immersive, low-key travel." - Alison Fox Alison Fox Alison Fox is a Travel + Leisure contributor. She has also written for Parents.com, The Wall Street Journal, and amNewYork. When she’s not in New York City, she can be found at the beach or on the slopes. Travel + Leisure Editorial Guidelines