If you were to go hiking in somewhere (over 30 minutes in) this is what I would bring:

• tent or tarp (Craig extra tent claimed by Billie)
• sleeping bag or wool blanket
• sleeping pad (thermorest or closed-cell foam)
• food (light but tasty) including snacks
• two water bottles (nalgene wide mouth are great)
• clothes - few changes, multiple backups
  • bathingsuit
  • light shoes like flip flops or tevas, to change out of your hiking shoes (if diff)
  • bandana
  • hat (for sun)
  • hat (fuzzy for sleeping in)
  • clean socks for sleeping in
  • synthetic or light weight cotton clothing (jeans bad)
• toothbrush
• pocketknife
• flashlight (headlamps are great)
• lighter
• bowl or eating cup and spoon and fork
• large garbage bag for rain protection and for picking up garbage on your way out
• a couple empty large and small ziploc bags, for your food garbage,
  or anything
• sitting pad or camp chair (totally optional)
• hammock (totally optional)
• thin cloth/tarp/towel to use to lie on the beach (totally optional)
• small book/art project/something to work on while lying on the beach (totally optional)
• backpack to carry everything

Shareable by a group (Elph has all of this):

• small flask of whiskey or suitable after dinner liquor
• first aid kit
• compass
• pots to cook in
• camp stoves with fuel
• sponge and biodegradable soap for cleaning dishes (and self)
• rope such as parachute cord
• small shovel for toilet duty (if bringing TP be prepared to burn it or pack it out)
• water or water filter or water sterilization tablets
• cloth bag we can use to hang the food in.
• small mesh bag to hang dishes in to dry and/or attach to food bag to hang
• small bottle bug dope
• small bottle sunblock

Elph has spare:

• 1 tent
• 3 sleeping bags
• 2 therm-o-rest pads (ultralight long)
• 2 therm-o-rest pads (3/4 length)
• 1 flashlights
• 3 bowls
• 4 nalgene water bottles

Joe will need to borrow:

• Backpack (from Elph)
• Sleeping bag (from Elph)
• Long therma-rest pad (from Elph)

Billie will need to borrow:

• Backpack (from Elph)
• Tent (from Craig)
• Sleeping bag (from Elph)
• 3/4 therma-rest pad (from Elph)

Craig will need to borrow:

• Water filter (from Elph)