Build a outdoor pen, use a fence or wall they can't climb as they are good climbers.
If you get a box turtle some of their favorite foods include strawberries,crickets,earthworms and other insects.
In time they recognize you and become very trusting.
You can add a pond to their enclosure, just make sure they can easily crawl out, if you wish you can stock the pond with frogs or fish.
Various snakes can also be kept with box turtles, just don't add anything less than 12 inches or it might be mistaken for a worm.
Many plants can get trampled in the enclosure so use plants tall enough to not get trampled.