I will add be prepared to walk out or stay overnight, just a day pack, sleeping bag, some basic food and water. Even small cheap tent is nice if you can not sleep in vehicle. Lastly - because I see this all the time decent good foot wear - flip flops etc do not cut it if you need to walk for a few dozen K to the mainline.
Recovery is nice, being with others is nice, but sometimes you are alone so be prepared. I solo 99% of the time, I assume at some point something will go south vehicle break down, hidden hazard you know murphy,