Hi, Eric! I'm so glad you stopped by the Disney Parks Moms Panel. As a mom of three boys (two of them teenagers), I can certainly appreciate the fact that you and your wife would like some alone time. It also sounds like your 13-year-old is mature and, therefore, unlikely to pull off any Phineas and Ferb style shenanigans while you're away for a few hours.
What I would recommend is letting your son explore your
Walt Disney World Resort hotel on his own. Depending on where you are staying, you could make a dinner reservation for your date night at a Table Service restaurant at your Resort hotel, and let him take himself to dinner at the Resort's Quick Service dining (and pay for it with his
MagicBand). We've done this with our Mouseketeers a couple of times; once when we stayed at Disney's Contemporary Resort and ate a leisurely dinner at
California Grill, and another when we vacationed at Disney's Animal Kingdom Lodge, and we enjoyed our glasses of South African wine (and a mighty delicious Braai Burger) at
Victoria Falls Lounge. This way he'll know you're still close by if he needs you.
Since children over 12 do not need adult supervision at the Resort pools, he might want to spend some time there (by the way, Walt Disney World Resort hotels keep their pools heated to a comfortable 82 degrees year-round, even in February). Make sure to pick up a Recreation Calendar when you check-in, so you can make a note of the various daily poolside activities, as well as the nightly
Campfire and
Movies Under the Stars schedules, all of which he could attend on his own.
Eric, I hope you and your wife enjoy spending time together during your night out. Or as Anna likes to say, spend some time "finishing each other's...sandwiches!"
Eean