No Rob, No refund if the launch window changes and if the launch gets scrubbed and you are on the KSC coach , then you lose everything. However, if you haven't put a foot on the coach, the ticket is still valid for that mission no matter when it launches. Usually they are rescheduled a few hours later if it is nothing serious like weather probs. Shuttles usually have 2 launch windows each day. Failing that, they are put back to the next day and so on. Its usually only really serious problems that get put back a week or a month etc. and if your holiday ends before the launch then I guess its bad luck.
I ordered the tickets now because, KSC usually don't put them up for sale unless they are 90% certain everything is going to schedule and I have a few days to play around with if there are any non serious delays.
I have also heard that if the shuttle doesn't launch and you have purchased tickets, KSC will exchange the lauch transportation tickets for admission to KSC tickets. But this is not a definite.
I purchased the launch transportation tickets STS 102 back in March '01. KSC sent them by UPS 2 weeks prior to the launch and everything went to schedule. We got lucky that time. Great atmosphere, proximity to the pads, NASA PA system, etc etc. These were just some of the benefits of being on KSC that day and i reckon its a chance worth taking.
Hope that makes sense ?
Regards
Paul.