Hi I'm brand new to the forum, but I have been following a lower carb programme as well for a couple of months. I too will be travelling to mexico and hope that I can manage there also. I don't want to eat a lot of fruit there in case it's been washed with contaminated water
I've decided to use my thera band for the weight training resistance work. I can easily fit on in my bag and it weighs almost nothing. You can buy them at any medical supplies outlet or gym...
I'm also going to pack lots of the trim advantage protien bars, because they 1) taste good and 2) they are all individually wrapped for convenience.

Good luck on your journey.