My top recommendation would be a trip to the museum - it's a great way to immerse young minds in art, culture or even natural history. Another option is to sign up for cooking or baking classes. These skills will come in useful and expose children to different cultures and tastes from around the world. You could also just stay home and crack open a good book with them and let their imaginations run wild. There are tons of excellent audiobooks too, which are especially great for reluctant readers. Alternatively, you could go old school with board games - they're fun and educational, especially for spelling and math!