I haven't been to Chile or Bolivia but I do have a few tips for traveling overseas. I myself have been to several overseas countries on missions trips.

If he is traveling overseas for the first time I would tell them to make a copy of their passport to keep in their bag or travel luggage for just in case purposes. In my travels I found that it was really interesting finding local shops and restaurants instead of just going to all of the touristy spots. Don't get me wrong I love seeing historical sites and everything, but I think this gives you a better opportunity to experience a culture like the locals do. It's an interesting perspective. If they don't speak the native language it's helpful to have some sort of phrase book in case of times when it's hard to communicate with people who don't speak English.

Don't bring a lot of flashy jewelry and keep track of what is in your pockets. In larger cities, local police warn of pickpockets so that is always something to keep in mind. When he reaches his destination, it's a good idea to get a map of the area. This will give him the chance to check out what is in the area, or in worst case scenarios, it will help him if he gets lost. If he's trying to find something around his hotel (or wherever he is staying at), don't be afraid to ask people at the front desk for ideas of where to eat, what to see and any activities he wants to do. Most importantly, don't drink tap water unless you know it is safe to drink! Go for bottled water until you hear otherwise. The filtering system is not as good in some countries as in others, so just use caution. You don't want to end up getting sick.
It seems that I've written a book. I hope this helps!!

I haven't been to Chile or Bolivia but I do have a few tips for traveling overseas. I myself have been to several overseas countries on missions trips.

If he is traveling overseas for the first time I would tell them to make a copy of their passport to keep in their bag or travel luggage for just in case purposes. In my travels I found that it was really interesting finding local shops and restaurants instead of just going to all of the touristy spots. Don't get me wrong I love seeing historical sites and everything, but I think this gives you a better opportunity to experience a culture like the locals do. It's an interesting perspective. If they don't speak the native language it's helpful to have some sort of phrase book in case of times when it's hard to communicate with people who don't speak English.

Don't bring a lot of flashy jewelry and keep track of what is in your pockets. In larger cities, local police warn of pickpockets so that is always something to keep in mind. When he reaches his destination, it's a good idea to get a map of the area. This will give him the chance to check out what is in the area, or in worst case scenarios, it will help him if he gets lost. If he's trying to find something around his hotel (or wherever he is staying at), don't be afraid to ask people at the front desk for ideas of where to eat, what to see and any activities he wants to do. Most importantly, don't drink tap water unless you know it is safe to drink! Go for bottled water until you hear otherwise. The filtering system is not as good in some countries as in others, so just use caution. You don't want to end up getting sick.
It seems that I've written a book. I hope this helps!!