I have been doing this for 15 years. And here is an interesting phenomenon I see - the longer, harder the winter, the later folks take to get out and book their summer vacation rental. Oh, they can't wait to get out of snow country for Spring Break to the islands, so that happens on schedule. But when it comes to summer vacation, many folks wait for that alarm clock that sounds when the weather starts to warm up a bit. These people just get up one morning and say "Wow, it's s