How can i keep a tarantula occupied?

Nothing much isn't really going to work considering that spiders/tarantulas generally don't do much at all, but just sit there similar to other cold-blooded animals like lizards and snakes, but yeah pretty much all they do is just stay hidden in one spot waiting for food, getting ready to molt, or just hiding/sleeping, but yeah this isn't a dog or anything so expect your spider to just sit still all the time, but as long as your spiders has a heat source, getting the proper diet, and has at least a hide then your tarantula would be as happy as can be, but decorating the tank can be alright, but the spider wouldn't care really. Hope this helped! Good Luck!