If this is your first time in the Inland Empire, welcome! My (Neely's) hometown is situated right below the high desert, an hour from the city, beach, and mountains. Here are a few San Bernadino County recommendations:)
In-N-Out Burger
31465 Avenue E, Yucaipa, CA 92399, (800) 786-1000
If you've never been to In N Out, it's time to change that. (Animal-style fries are a life-changer)
The Living Desert Zoo and Gardens
47900 Portola Avenue, Palm Desert, CA 92260, (760) 346-5694
Joey and I went here the first time he visited me in California. It's a desert zoo - they have a section where you can walk with wallabies.