I use my GoPro very much so I assembled a small kit for my GoPro Hero 3+ which I take everywhere I go. It includes:

SP POV case GoPro edition
LCD BacPac
Battery BacPac
Floaty backdoor
Spare Battery
-Sim Card adapter
GoPro WiFi controller
-Non-waterproof backdoor
-Cleaning Napkin
-USB charger for the GoPro and controller
Tripod mount
Standard Low and High mount
-3x Screws for attaching GoPro to mounts
Rubber damper
-3M sticky mounts
GoPro 3+

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This is a great DIY kit that has saved me on numerous occasions when I needed an extra battery or to view a photo I just took using the LCD backpack.