(spoiler alert re: mexico)
you get to mexico after you take out Fort Mercer. just keep following the storylines and you'll hit it eventually. it's about 40% through the completed game (i guess?).
Sweet thanks! I've been delaying the Fort Mercer quest line because I thought it was the end of the game! lol, guess not, don't need any more spoilers after that please, but glad to know it keeps going after. Also good to know about Thieves landing, I've been looking to go on a GTA style rampage, but with all this honor/fame I was reluctant lol.
Also, I've not seen those glitches, the bird people are to funny. I've got to find a damn Sniper rifle also, the Armadillo gun store doesn't have one and the thieves landing gun store owner was dead when I got there (who killed him?) and it said he wouldn't be back for 5 days.