Take the trip. I know not what you expected to hear, but as you get older (and I am only 30) things start to creep up on you and vacations are harder to come by, children, significant others, older parents can get in the way of a trip of a lifetime. It sounds like your dream trip is very an active one, so you will want to do it when you are young, and can enjoy it to the fullest. TFCK will be around a long time, and probably have that kilt suit you are eyeing for a long time as well.

Just my own opinion, good luck with your decision.