Hi Kara,
Thank you for the compliment on the panel. As I'm sure you know, Walt Disney World Resort is huge! It's impossible to do everything in one trip unless you are staying for several weeks (and even then I'm not sure you could do it all)!
With 5 full days, I recommend spending 1 day each in the Magic Kingdom, Disney's Hollywood Studios, and Disney's Animal Kingdom. I recommend spending 2 days in Epcot. The
Epcot International Flower and Garden Festival will be going on during your visit; I think you will need additional time in Epcot to enjoy it.
Be sure to make some Advanced Dining Reservations (ADRs). The California Grill on top of the Contemporary Resort can be very romantic. I also recommend Jiko in the Animal Kingdom Lodge and Citricos in the Grand Floridian. If your budget allows, you might consider dining at the Chef's Table at Victoria & Albert's in the Grand Floridian. It's an amazing experience and while it is very expensive, most guests tell me that it is worth every penny!
Finally, you might think about getting a couple's massage at the Grand Floridian Spa or at the Spa at Disney's Saratoga Springs Resort.
Have a magical vacation!