Please leave a copy of your itinerary. Please confirm the campground's pet policy. Leave your fire burning overnight, unattended. If a small ember is caught in a gust of wind, it can have dire consequences.
It's also highly recommended to carry a bear spray with you (and check how to use it before going camping). Throw away trash (which could mean taking it home), make sure the fire is turned off, and store your equipment in a backpack, trunk, or motorhome. Have a plan for how to manage your waste. Be sure to dispose of garbage in a garbage dump or in a suitable location away from the campsite.
Please carry some garbage bags with you. If there are no sanitation facilities near the campsite, bring a portable toilet. Toilet paper doesn't biodegrade quickly, so pack it too.