Which ranch are you hunting ? I have been down that way twice. Hunted with Jeff Massie when he ran an outfit that way. Had a great time both times. Both times I was there things were fairly green.
I wore standard cotton long sleeve T shirts to hunt in and fairly heavy boots (because of cactus). I never saw a snake, although I was looking. Just be careful is my advice.
Bring a bunch of blunts or judos cause there are a ton of bunnies down there.
They " corn" the senderos down there. Don't use too much corn, only a dribble. They do this cause in many or maybe most of the areas you cannot get off the road to do a stalk in the pastures. Too much brush and cactus, and EVERYTHING has thorn's like. . two feet long.
knee pads are a good idea (don't ask me how I know). Try something if you can't sneak close enough. Get down on hands and knees, hold your bow so it adds to your front, and pretend you are feeding, just like the javelina, and work your way toward them, right out in the open. of course. . . there is always the cow suit.
Bring plenty of hydration means. I also like to have a light tarp, maybe 5 x 5 with a way to tie it to make a sun shelter for yourself to sit thru mid day sun.
I found that the senderos (sand and gravel roads) get packed and have a tendency to get noisy later in the day after getting pounded by the sun. I wore a pair of Baer's feet or similar padded footies and thought them to work well. Soft shoes and walking in stocking feet might work, but man you get just one cactus thorn thru the side of your (Bean boot)shoe, pinning your foot in and you will get the biggest, meanest boots you can find (again, don't ask).
If you have a ghillie suit, take it.
Good luck down there.
ChuckC