Welcome to the Daily Puppy Britt! Deerie Me has given you excellent advice.
It is better to be safe than sorry, and you will have a lifetime of wonderful dog park experiences ahead of you. Please wait until he has finished all of his shots. That advice is given to people, particularly new puppy owners, for a reason. Imagine how you would feel if your dog contracted something that could have been avoided if you had only waited a few more weeks.
After waiting a lifetime for your special friend, a few more weeks of not going to the dog park won't hurt a bit. Enjoy your lovely puppy!