I thought about that after I pushed send. I do usually print out a Topo map from my computer and carry that map with a GPS.
When ever I'm not sure where I am, I can look at the GPS and pull off my coordinates and compare them with the map to see where I really am vs where I thought I was.
A good example of this was a recent ride into canyon country near Goblin Valley. We were looking for the entrance to a slot canyon. Well there are a lot of canyons in canyon country. By looking at the GPS and comparing the coordinates with the topo map I printed out, I could see I needed to go more to the West. When I got to the entrance of the canyon that I thought was Chute Canyon, I again looked at the GPS and confirmed that I was entering the right canyon.
Now the fancier and newer GPS have the maps built into them. But I haven't seen the need to spend the $200 to buy a new GPS, when my 14 year unit works just fine.
Besides my horse and tack lol I take a bottle of water, snack, and cell phone. This is usually good for a three or four hour ride...if you were to litterally go ALL day...I would pack a small lunch in my saddle bags lol
I do put splint boots on my horse...but that just cause I personally like having some form of protection on his skinny little TB legs lol.
No food or water for me (I fuel up before I go). I bring a halter and lead rope, pocket knife (as stated above), cell phone for sure!!!! Also, we put bells on the horn of the saddles to ward off deer, and let others' that we are there and we are not deer or whatever. OH...and the most important thing of all... my pistol! I carry that with me too. I know some people might role their little eye balls at that but hey, it's what I do man. It could end up saving my life one day. Also, others' have told me that you can use your horse as a weapon, but what happens if that doesn't work out?
If the park is really rocky I use hoof boots (easyboots). No splints though (although I use them in ring). It's always a good idea to keep halter and lead rope with you, but frankly I never do. I ALWAYS have my cell/driver license with me though.
I wouldn't put boots on the horses legs - If they get wet and dirty they'll rub and cause more problems. My horses bulldoze through anything on our trail rides and it never seems to bother them. They don't even get scratched up from plowing through thorns.
I have a very complete first aid kit (I'm a nurse, I've had a hard time keeping it limited - I'm one step from taking the kitchen sink. LOL) and a small book on horse & rider first aid. I always take snacks, water, toilet paper, chapstick, matches, pocket knife, sunblock, and my pistol. We also have "headlight" type flashlights that are handy if we're out late. I always bring extra layers of clothes because on sunny days, it can be a lot cooler in the heavily shaded woods. Where I ride is pretty remote and there's no cell coverage most of the time.
I don't use boots or anything on my horse's legs, and I usually take food (i'm always hungry), water, a poncho, and a pocket knife. My dad always carries a little tool he made for pulling off shoes in an emergency. As far as riding in Ohio goes, I'll give you a list of State Parks I know of that have horse trails; most of them are around central/Southern Ohio:
-Hocking Hills (lots of trails, great scenery, a little rocky)
-Salt Fork State Park (nice trails)
-Tar Hollow (haven't been here in awhile, but they have a lot of trails)
-McConnelsville AEP Lands (if you're close enough, this is a great place)
-Alum Creek (shorter trails, but near Columbus)
-Burr Oak State Park
I can't think of any others right now; where I live (near Zanesville, Ohio) we've done lots of riding on AEP and strip mine land where we're allowed. Just check into the state parks around you to see if they have bridle trails, usually these trails are pretty good. If you do ride on AEP recreation lands, sometimes a permit is required, I think you can print one or get one from a hunting license store near there (that's what we did)