If you meant within the tank, there are plenty of things available for bearded dragons to climb on. If your beardie likes to climb a lot you could get some interesting pieces of driftwood from pet stores or huts for him to climb on top of or hide underneath. Hammocks are a popular choice, and you can put them at different levels to make a climbing course
. There are some bearded dragons that enjoy sitting on small plush toys too, it all depends on their personality.
As for out of the tank, exploring beardie-proof areas are always fun for them. If you have any other pets just make sure they are out of the area while your beardie is running around, and be aware of small spaces he could scurry under or into.