WOW!!!
what an ambitious undertaking !!!!!
you didn't mention where your trip begins or i just missed it and your home base/area is not mentioned in your stats
Padre Island National Seashore as shown on your map is mostly uninhabitable for normal folks w/ average vehicles
4x4 is an absolute and so is high ground clearance
AWD SUV's/grocery getters wont cut it
there is open beach camping(if the park is even open) south of the visitor's center and a bit down the way there is a sign warning folks about being ON YOUR OWN and they mean it
no services of any kind past that sign

- natl seashore sign.jpg (23.45 KiB) Viewed 2400 times
once past the sign you can not expect any dependable cell service and unless you have a sat-phone or marine band radio you will have to walk out in the event of issues
thatsa LONG WALK and recovery from that area is EXPEN$IVE
if intending to camp on the island best to stay up near the visitor's center or go up the island to between Corpus and Port Aransas and stay at the Mustang Island State Park if you want a beach experience
camping down there IS WINDY and sandy particularly if you camp on the beach
at this time of year the beaches are usually cleaner than in the summer when the seaweed and washed up trash can be a real issue
for the most part the beach is not groomed by any stretch of the imagination though in the winter it isn't too bad
the beach is considered a public roadway and in the patrol'd area speed limits are enforced
when measuring distances down there it is in hours not miles as the speed limits are low and miles can mount up
when coming off the island we always stop n eat at a place called Snoopy's where hwy 361 goes over the ICW
mostly fried seafood and right on the water w/ tugboats pushing barges along w/ fisherpeople n sailboaters running up n down the ditch right in front of your table
the Texas State Aquarium is located right by the aircraft carrier Lexington under the big tall Harbor Bridge in down town Corpus
my family loves the aquarium
from Corpus San Antonio is just over 3hrs up the blvd or about 4hrs up 181 thru the country
be prepaired to do some walking in SA to see the Alamo and River Walk as the parking garages are a coupla blocks away
do stop in the Menger Hotel(across the side street from the Alamo) for a treat of western history
it was in the bar there where barb'd wire was introduced to the west
heading west from SA on 90 is Brackettville where the movie The Alamo w/ John Wayne was filmed
hwy 90 runs just south of Texas Hill Country which does take some time butt sure offers some different(for Texas) scenery
running on west on 90 and just after you cross the Pecos River on the high bridge is Langtry where Judge Roy Bean(Law West of the Pecos) held court and the original Jersey Lilly court and bar building is still standing
good place to stretch your legs
turning south on 385 at Marathon make sure you're fuel tank is top'd off
once in the park speed limits are much sower than out on the highways so plan on extra time
the main visitor's center in the park is @ Panther Junction where fuel is sometimes available
you can learn what you need/want to know about the park there
leaving the park turning west @ Studdy Butte on 170 you will go thru the thriving community of Terlingua where the 2 world championship chii cook offs are held the 1st wknd of November each year
take the little side road into "town" and visit the general store
on west to Lajitas where there used2waz(before 911) an informal border crossing
on west to Presidio along the Rio is a beautiful drive
somewhere just before you get to Presidio is the turn off to Big Bend Ranch State Park which is plumb desolate
1 hour and 10 minute/26+miles dirt road from 170 to park headquarters
north on 67 from Presidio you go thru Shafter where they mined cinnabar
between Marfa and Alpine is a highway pulloff where you can see the "Marfa Lights" at night(look them up)
north of Marfa is Ft Davis and the McDonald Observatory
then on west to ELP or north to the Guadalupe Mountains National Park and Carlsbad
BON CHANCE
sw