Hi, Robert!
The first night at Walt Disney World can be exhausting if you are set to arrive late at night, so you may reconsider once you get into your room at 9 p.m. (especially if you are delayed getting there.) On those nights, we go to bed early so that we can be at a park first thing in the morning, sometimes before dawn!
On the other hand, there is a lot that you can explore without having to enter a park at that hour, so consider an option that won't require you to use a full day's worth of a park ticket for just an hour or two.
Downtown Disney, for example, would be the perfect place for you to get a bite to eat, shop, see a movie, bowl a game or two or even relax and have fun with live music in a few locations. You might want to head over to a monorail-area resort, have a bite to eat there, then head over to a lake-view vantage point from which you can see Wishes nighttime spectacular from across the lake. If you're staying at a Boardwalk area resort (or can get there) that area is very much alive at night, with restaurants, Boardwalk entertainment, a "lively piano bar" named
Jellyrolls and
Atlantic Dance Hall, a great over-21 nightclub that doesn't even OPEN until 9:00 p.m. You can even catch a bit of the pyrotechnics of Epcot's Illuminations from the bridge that crosses the waterway from Crescent Lake to Epcot's International Gateway. Be there by 9 p.m. for a lovely view of the fun.
Let me know which resort you'll call home while in Walt Disney World, and the date on which you'll check in; there may be even more for you to enjoy right near your own resort, too. I'd be happy to help!