Hi Heather,
Ahhhh...a couples massage at
Mandara Spa sounds absolutely magical...and relaxing...and romantic! What a great idea!
Mandara Spa is located at the Walt Disney World Dolphin Hotel. There are a couple ways you can get there from Disney's Port Orleans Resort - French Quarter. The easiest and fastest would be to take a cab directly there from the hotel. The ride would only take about 10-15 minutes, but you would have some out-of-pocket costs (probably less than $20, including tip).
If you'd prefer to take the complimentary transportation, I'd recommend taking a bus from your hotel to Disney's Hollywood Studios. From there, you can take a boat to the Dolphin. You'll find the boat launch to the right of the park entrance. There is also a walking path on the opposite side of the lake. Not counting time you may spend waiting for the bus and boat, this route takes about 30-35 minutes, so I'd allow yourself at least an hour or so in travel time.
Wishing you a pixie-dusted vacation, Heather! Please visit us here on the Disney Parks Moms Panel again if you have any other questions as you finalize your plans.
Beth