7. Portable charger
This is definitely a must have, especially if you plan on posting to your social media channels throughout the day. While you could bring the full charger and find outlets to plug your phone into, this is time consuming and the outlets could all be in use. Using your own portable charger allows you to still enjoy the park while simultaneously charging your phone. My personal favorite is the FuelRod that is sold in every park because you can switch them out at any FuelRod station and get a completely charged one for free.