I've been planning on going on a cruise for a while now and was planning to make the reservations..then I saw something that said you have to be accompanied by someone over 25 to travel on a cruise..unless you're 21. I was just wondering if there are any cruise lines that let you travel alone when you are 18+ without having someone older to accompany you? I've heard of some but they cost a lot..trying to stay in a reasonable range. Thanks in advance.