Welcome to planDisney, Nathan!
Like Anton Ego from Ratatouille, I don't just like food, I
love it! That's why I'm so jealous that you're dining at
Trattoria al Forno. As you mentioned, this casual Italian restaurant is located at
Disney's BoardWalk. This is one of my favorite areas in Walt Disney World. I particularly love going on a stroll around Disney's BoardWalk during that golden hour of the day and then watching the sunset. The ambiance is very romantic and relaxing.
Nathan, if you're staying offsite, you'll be able to park at
Disney's BoardWalk Inn. When you pull in, you'll be able to speak to Security and inform them you have a dining reservation. They might ask to see it on your My Disney Experience account, which you would show on the home page of the app. From my own experience, I believe you'll be able to park for up to three hours max. Therefore, once you finish your dinner, you can enjoy some time exploring Disney's BoardWalk.
If you're wanting to watch the EPCOT nighttime spectacular,
Harmonious, then you'll need a valid theme park
ticket and
reservation to enter EPCOT. However, if you're just interested in watching the fireworks, then you'll be able to see some of them from Disney's BoardWalk. Just keep an eye on the time! You don't want one of those "Cinderella-Clock-Striking-Midnight" situations and find your car has been turned into a pumpkin when you return.
Thanks for stopping by planDisney, Nathan.
Mike