How to discourage my fiance from hiking the WHOLE Appalachian Trail!?

[dreamgirl]

Tell him..thats a great idea..but lets try it slow..go camping for the weekend..get one of those cheap tents,check the weather pick a rainy day or two...forget the mosquito spray open the tent door slightly..he'll never want to go camping,or hiking up a trail again.

 

[shadow1]

So my fiance has had the recent idea for the last few months that he wants to hike the WHOLE Appalachian Trail after college (2 yrs from now). He says he wants to do it because he wants something that is character building, life changing, and something that not a lot of people have done, and a personal goal, which I understand and don't discourage, but I don't think he realizes what a big undertaking that is! 3-5 months of living outdoors like that, all the problems that can arise, not to mention all the crazy people out there now a days! He wants me to go with him, but that is just something I know I would not enjoy and isn't something I would have the personal discipline to do. I have tried to explain to him all the difficulties but he doesn't want to listen to me. And we are engaged to be married a few months after he graduates college, so he will be gone for most of the time the wedding planning will be taking place! But he wont budge on it. I really am the type of GF that supports my man on everything, but this I just don't know about. Any ideas of other character building, and life changing, and something that not a lot of people have done things that he could do? Anything will help. He doesn't want to listen to me! Or am I the wrong one?
26 minutes ago - 4 days left to answer.
Additional Details
Well not to be down on my man but hes kinda a sissy. I know how he is, he will be all gung ho about it and half way into stuff he looses interest. but i will say that we both plan to travel the first few years of our marrige. we are moving to Colorado right after we get married for a few months, then to Canada, Alaska, Europe, and where ever else. And we hike all the time and go camping and do lots of outdoor things. I just think that is taking it to the extreme. I just think there are more meaningful things to do, like helping charity or going on a mission trip or something, that can also be life changeling and character building...