They look like normal wellies, I do not know about the sole. For hiking you need something with good grip and stability, neither of which is provided by the type of footwear you are planning on wearing. Ankle support, is also imortant for going on uneven terrain. One other thing to consider hiking in the rainforest is protection from things that could poke you or penetrate not just the bottom of your shoes but other areas too. Walking over rocks and stuff, you need a solid sole that will not bend around the rocks and allow them to push up against your feet, that will lead to a lot of discomfort and may even cause you to lose your balance. If it's a short hike and you'r not planning on doing too much on uneven terrain, and you do not have any other shoes available, then try them out carefully. If you plan on doing more than just one quick trek around one place, I would suggest better footwear, something with laces and a solid sole. Even those teva sandals are probably a better choice than wellies for that kind of activity.
1. hiking trip: how to eat healthy and lose weight?
If you eat healthy for two weeks, your body will naturally begin to crave healthy food and the greasy stuff wo not sound very good
2. What are some general Dangers of Hiking in the Yukon, or Alaska?
bring bug spray
3. What is a good underwear for long hiking trips for a teenage boy?
For any male, I recommend the boxer briefs or boxers. Biker shorts might be good as under-ware I guess. I have never wore them but I hear they have a sort of ventilation material. In any case, have him take an extra pair of a different kind in case what he has is not working out. An extra pair of cushioned socks is a good idea also. The kind used by the United States Army or U.S. Marines, sold in Military surplus stores should be a good choice since those men and women run for up to 4 to 6 miles or more at a time and go on forced marches which are long and at a very fast pace. Sports equipment stores should also have some good socks and better ideas on what under-ware. Biker shorts are not cheap. Walmart is probably the cheapest place for under-ware. Nothing I know of will stop odor if you are in it for over one day. You will need to take a bath and change. I would not worry about odor if all of you are hiking and sweating. Do you think Marines, Soldiers, or Navy Seals are concerned about how they smell after running all day? I have gone on runs with women and how we smelled never came to mind. We were all soaked in sweat.
4. Hiking the AT at 15?
I think your goal is ambitious and I hate to discourage you, but I think you should wait a few years to tackle that alone. There could be some possibile legal ramifications not only to your parents' (as Bart pointed out) but also to you. Technically the AT falls under the Dept. of the Interior and much of it crosses National Park or in some cases National Forest lands (USDA) so there are laws about "unattended minors" you could violate. I spent a week in the Adirondacks when I was 16, but I went with a few buddies. My mom was freakin' out but my dad was pretty cool with it. But then again...we were guys and it was 15 years ago. We encountered one ranger who was a little less than thrilled that five 16 and 17 year olds were out w/o supervision...but we flashed out Eagle Scout and Advanced First Aid cards and nothing else was said. Rather than just one friend...maybe you can snag a few friends to join you. Go out for a long weekend in June for a test run and then if all goes well, all of you head out for a few weeks later in the summer. This will show your are nts you have the ability, but also you can see if your friends can hack it. Failing that, your parents might let you do a summer program with NOLS or the Philmont Rayado Program. It might not be something on the AT, but you would be with a group, supervised, and chances are the parents might go for something like that. Personally, I am 33 and I think I would still rather do it with a small group than by myself. You get to split up gear and it boosts your safety factor. I solo hike a lot too, but having a partner eliminates the chances of you having to go to drastic measures (ie Aaron Ralston) if you get injured. Good Luck!