Bring plenty of clothing for cold weather, hot weather, and everything in between because of air conditioning, etc. If you are not familiar with being on the water, bring something for seasickness-gravol is the best. Pace yourself. I found that going on tours when I was in Greece was best to keep track of time. If we were late or missing, our leader went looking for us. When you are traveling by yourself, if you are late or get lost no one knows until it is too late. I don't even want to mention if you went missing. I just don't consider it safe for a woman to travel alone anymore. mom did it all the time when she was young.