red dead redemption questions

After making it to mexico do you still only see one train? On page 245 of the red dead redemption book (sold at walmart) there is a mission where you get to fly a handglider, is that for real? Also I did that all areas cheat (Lewis and Clark) and I dont have all areas, does this cheat not work? How do you get it to work? How do you quick-travel to mexico and the snow area?

Yeh im pretty sure that by using any cheats it disables trophies and the handglider is part of a stranger mission and you dont get to use it.

You need to complete Mexico before you can travel to the snow area. You can quick travel to any area uve opened up by setting a waypoint where you want to go and use a stagecoach/train or camping to skip the travel