We just returned from a trip to both parks with the most of our stays in the Big Bend ranch state park. We stayed at both of the sites mentioned previously and loved both ----even with high winds at Guale#2 -- which is totally exposed but spectacular. Travel into the INTERIOR park is on a wide graded gravel road that any vehicle can traverse but once you move towards the majority of the campsites like Guale or Chorro Vista, the going gets real slow and they advise 4 wheel drive is recommended. I agree with them. We towed a small 9 ft trailer and it took us 1.5 hrs to go 8 miles and 2 hrs to go 10 miles. The ranger station in the middle of the state park has potable water, showers, and even an ice machine but we didn't find it open either of the days we passed. Those amenities were available even with the station un manned. AS mentioned--- no fuel is available in the ranch state park so allow for that in your planning. The other portion of the Ranch state park is the River road --- which follows the Rio Grande and has multiple camping areas along the route. Two visitor centers on either end of the park issues you the camping permits needed as well as provide current conditions updates. We stayed at Upper Madera camping area along the river road and found it a nice spot to stop on our way to the National park. Weather was magnificent ( late FEB ) although the WIND was a factor as mentioned. If you are looking for solitude and beautiful country and are self sufficient --- the Ranch will certainly meet you goals. We plan to go back and explore the east side of the Ranch state park as we didn't have time to go that far.
We only visited the National Park on a day trip and found the camping area in Chisos Basin very cramped .... learned there are many options for back country camping that can be discussed with the rangers at the visitor centers. If you go .... visit both areas and enjoy what they each have to offer.
a few pix
Guale #2----
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Chorro Vista camp
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Upper Madera campsite sunrise
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all I can say is GO.... other stops on your way that you may like that we visited
Davis Mountains State Park-- FT Davis, TX
Terlingua, TX---
Santa Elena Canyon--- located in National Park ( south west corner )
Bart