I know one of the camps has a Campground, (used to be a Yogi Bear) across the street, where we would to go rent the WARM showers! Actually there were a lot of shower rentals in the past along the road with a sign, for the Deer Hunters who didn’t have amenities in their camps. Not sure if those are so widely available now, with everyone having trailers with LQ. Sun shower bags are popular for use inside your trailers.
A lot of the Other Half (non-rider) folks will move the trailer ahead to the next camp, so you ride out and “arrive” at home when you reach that camp. The OH goes fishing, does other things during the day hours. If you have friends there, maybe the trailers could move ahead, drive back in one truck, to all ride to the next camp. Then go get the first truck. MTRA has a bus to haul back the rig-jumpers each morning so they can ride, when doing the organized rides.
Each of the camps is a State Park, but being horse camps, they haven’t had the same bathrooms (no showers or running water), that plain camping folks have in their campgrounds. Hand pumps with COLD water were the norm last time I went. However the State is occasionally using horse camps for overflow campers, so bathrooms could have been improved.
There are some GREAT water crossings, bridges that go forever over the mud flats. My horses learned a lot by going, and were eager with plenty of FORWARD the whole day toward the new “home trailer” with food waiting at the end of the day. They “got it” about the third day out, that there was no going back, food is ALWAYS ahead.
You should probably get the map packet sold by the MTRA, has lots of extra information, like use ONLY MARKED watering places. That mud can REALLY suck a horse in. I ALWAYS carry a lasso, have needed it a few times to pull horses out. The MTRA has work sessions to keep the blue trail marks bright, but they do get lost, overgrown, removed, so you have to pay attention or be able to figure where to turn by trail use. DEEPER going is usually the best choice. Compass and ability to use it is good with the map, because one piney two-track can look JUST like the other one you don’t want! I am not familiar with GPS units, maybe those would work better for you.
If you get a wet, warm day, you might be able to pick Morels for supper. Sure a great finish after a day riding.