I also go through my hydration pack and toss out the leftover gel packs and energy bar wrappers and restock them.

I have a large duffel bag that I take with all my MTB clothes, socks, gloves, eye pro, shoes, and helmet. I verify its all there and stow it next to the bike. I did a long trip once and forgot my shoes once. Now I have two pairs of shoes!

I carry a tub of baby wipes in my car for the quick washdown of dirt, sweat, and blood.

Its nice to have a fresh change of clothes after a ride for those post ride eats.