What are some fun outdoor thing to do with puppy in general (besides walk)? Any reccomendations around Boston?

I've gone to a doggy park and it was fun. Any other suggestions?

During the summer you can take him to the fountain in front of the New England Aquarium waterfront park (there is a fountain there) you can also take him to the common to watch the swan boats and bark at the squirrels. Plus, the ocean is right there a walk on the beach is not that far away

you could have sex with it

You could try teaching him to fetch a ball or to play frizbee these are some of my dogs favorite things to do!

take him/her to the park and play fetch