Rabbit play is most often different than the type of play you expect from other pets like cats and dogs. Rabbits play by exhibiting natural behaviors, like chewing, digging, practicing their hiding and escape moves and routes.
So things like shredding up cardboard boxes and paper, chewing up willow or grass mats and tunnels, chewing rabbit safe wood branches, running around and exploring rooms and tunnels, mapping out where they can run and hide if they get nervous.
Most rabbits don't play with toys or objects unless it's to get to something they contain like food,. And then they aren't really playing with the object but are just trying to get to the food they want. Or they may chew or dig through boxes or other things to move them out of their escape path or to rearrange their environment to suit the way they want it to be.
I would suggest trying the things that Blue eyes mentioned, like cardboard boxes(provided your rabbit mostly shreds the boxes and isn't actually consuming more than tiny bits, if any at all), newspaper or old phone books to shred up, dig boxes filled with crumpled newspaper to dig in and shred, safe digging spaces outdoors in the soil, rabbit safe branches or other safe natural things like willow baskets, grass mats, or grass tunnels to chew and destroy.
It's really just a matter of finding the things that your particular rabbit likes, as not all rabbits like to do the same activities. Activity level and what they like, has to do with individual personalities, hormones, and metabolism. Some are more energetic than others. Some are busy little things that will try and destroy anything not rabbit proofed, if given the chance. And then there are some that love nothing more than to laze about in front of a warm fireplace or heater in winter, sit by a cool air vent in summer, or lay next to their owner getting head rubs. Also keeping in mind that a rabbit laying around doesn't necessarily mean they're bored. Rabbits are generally most active in the early morning and late evening, and are pretty inactive during the middle of the day, preferring to mostly sleep during this time.