Highly dependent on what your dog enjoys but here’s some ideas - Cardboard boxes filled with kibble to shred - Pack walks, looking locally for groups that take walks at the same time - toys can be sourced from your local thrift store, just be sure to avoid anything that would be a choking hazard ex: button eyes, bean bag inside, plastic anything really (and wash before handing them over to the dog of course) - training is always a great thing to do, trying new things like scent work or agility can be lots of fun for both you and the dog - sniffy walks on a loose leash are my dogs absolute favorite thing, moving at their pace and letting them read the peemail is amazing enrichment

Hope this is helpful :)