Greetings.  There are many, many people who already live in those locations, and around the world, that are adept photographers who have filled libraries with their work.   It is unlikely that your vacation shots will garner much interest from buyers.  Instead, spend time with your (not yet bought) camera, and learn the ins and outs.  Take a class.  Experiment.  Have fun.  Don't worry about stock photography.  Heck, it might even ruin your vacation, worrying about what is saleable and what isn't.

Shoot what you want, where you want, how you want.  At the end of the day the good art will rise to the top   Everything else will be buried. 

I'm more of a video droid, but I'm also off exploring South East Asia this year. Have sold my Canon 600D, massive tripod and a bunch of lenses in favour of a DJI Osmo. It's far from a pro camera (not that my Canon was either though), but stabilization is key when it comes to commercially viable stock footage and my tripod would take up half of my luggage size and weight allowance!

I'm not expecting to retire from the footage I take when I'm away, but hopefully I can get a few decent shots a week. If you (and I) expect to make nothing from our images, then anything over and above will be a bonus. Not saying that it's not possible to earn a bit on the side from our travels, but seeing I got more on Ebay for my Camera and lenses than I paid for the Osmo, then I may as well give it a go. I probably wouldn't have bought it if I couldn't have sold on some existing kit. 

Anyway, have fun travelling. Will be in Vegas for ten days early June, couple of days in LA, then over to Bangkok for five days, Chiang Mai for five days and then wherever the wind take me. Vegas first was probably a bad idea... might run out of money before I get to Asia!

Welcome Daniel,
Good luck!!