Are you having any issues? Typical issues are feather picking, bullying, even cannibalism. Are you confusing contentment with boredom? One of their pleasures is laying around doing nothing.
To me the greatest boredom buster is room. If they have sufficient room they are generally content. If they are crowded you get behavioral issues. Those issues are not from boredom, those are from being too close to each other too much.
I agree, some photos could be helpful to come up with specific ideas. What do chickens like to do when they are not eating or drinking or laying eggs or mating if you have a rooster? One is laying around doing nothing, often in the shade or under a tree or bush so they are protected from hawks. That's part of their survival instincts. When feral chickens are foraging for food they are vulnerable to predators so once they fill their crop they go somewhere safe to digest it.
They like to take a dust bath. All they need is an area that has dirt in it. This helps control mites and lice, or at least stop the itching.
They like to perch. It doesn't have to be real high, just somewhere they can get up off the ground to make watching for predators easier. They may even play King of the Mountain.
They like to scratch. That's how they look for a lot of food and bits of gravel for grit. They will scratch in dirt but bedding can be fun to scratch in too. Maybe try deep bedding. Putting a compost pile in the run can provide a lot of enjoyment.
If you are not having issues then none of this is probably needed, but it doesn't hurt anything either. If all this does is make you feel better because you are doing something for them, there is value in that too. If it helps you enjoy your chickens then go for it.
