first-aid kit, flashlight with an extra battery, radio with extra batteries, multi-tool, whistle to signal for help, and a map of the area. If you have children, make sure to pack some special items. This could include things like a teddy bear, a coloring book, or a set of crayons...
This set includes binoculars, a compass, a butterfly net, a magnifying glass, a backyard exploration critter case, a whistle, tweezers, bug containers, a hat, and a backpack. Promising review: "The binoculars are great quality, as well as the awesome flashlight that doesn’t require batteries...