What are some fun activities to keep my puppy happy?

You want them to be able to interact with you. You are kind of their life, especially if you don't have a lot of other animals. They come from having their mom and a litter of other puppies to play with, so they're relying on you to keep them social and active. Interacting with your puppy and training the puppy is something you can do for play. Offering different types of toys and different interactions like that can really keep them stimulated.