Here are just a few suggestions of items to bring along on your vacation:

Camera (you'll definately want some photos!).
Sleeping Bag (please let us know if you would rather have us round you up one!).
Boots are very important, no tennis shoes or flip flops for riding. You're more than welcome to wear whatever you like around camp.
Jeans-however many you feel you need for a week.  Usually a tighter fitting pair is best, you will have less chance of saddle sores!
Summers are hot around here, so a hat of any sort is a great idea to protect you from the sun.
Sunscreen and chapstick with SPF.
Towels and other personal toiletries. Outdoor solar showers will be available throughout the week while camping. Canteen or other water container.

Hopefully these suggestions will help make your vacation at the Long Ranch just a little more enjoyable!