Cruise lines are among the worst offenders when it comes to charging "single supplement fees" for those of us — me included — who travel alone. When a cabin for two is only occupied by one, the cruise line charges as if there are two people.

But cruise companies are learning that singles are a huge part of the travel market. If you want to meet people on board, don't worry —  singles' lounges and meal seatings are options to mingle. Cruises are also beginning to waive the supplement fees, though not widely yet. However, the Norwegian "Epic" now offers 128 studio cabins just for singles — which sold out almost immediately. And other lines will likely soon follow.

Also of interest: Are you allowed to BYOB on your cruise?