Originally Posted by Mxpatriot
Strap (and ensure you have secure mounting points front and rear)
Tools to change a tire (spare tire implied task)
Fix-a-flat in case you get two flats
Map / compass / GPS
Flashlight / batteries
Phone / charger
Fire starting material
First Aid kit
Walk out bag
Warm clothing / change of clothing
And leave a 5 W's with a no later than return time with a trusted friend.
This is a pretty good list but I'm not sure you need to go armed to the local off-road park... To each their own level of personal security I guess. But some more popular parks may actually have rules *against* firearms. Check before you go.
If you go with a buddy it's very convenient to have a pair of FRS radios so you can talk to each other - even if there's only one truck, it's handy for the spotter to have one and the driver to have one.
Well developed off-road parks probably have a map at the gate. Having a compass to orient is handy. GPS is overkill unless you already own it.
Lunch/snacks, and water bottle - say a quart of water per person.
Sturdy hiking shoes. Sometimes you gotta get out and scramble around spotting, scoping out the terrain, or getting unstuck.
Sunscreen/insect repellent for the same reason.