Hi there, Janet,
Welcome back to planDisney! It's a pleasure to be part of your Disney vacation planning. I'm especially pleased I get a chance to help with planning a trip aboard the Disney Cruise Line.
I quite enjoy the walking/jogging tracks that wrap around the outdoor promenade of the Disney Fantasy and the other classic Disney Cruise Ship. The Disney Treasure, similar to its sister ships the Disney Wish and the Heroes and Villains-themed Disney Destiny, also features a shipside promenade. However, the outdoor promenade on these three newer ships doesn't form a continuous loop around the ship. Instead, passengers strolling the outdoor promenade can enjoy magnificent ocean views on not just one deck, but three decks.
The entirety of the Guest-accessible shipside promenade of the Disney Treasure forms a U shape. The two extreme ends of the U shape start on either side of the ship near the aft elevators on deck four. The promenade elevates to the sides of the ship outside of Senses Spa and the Fitness Center on deck five. The culmination of the promenade, and my favorite part with its stunning panoramic view, wraps around the bow of the ship on deck six. Stairs connect the three levels of the promenade for uninterrupted outdoor enjoyment of the entirety of the promenade path.
While the shipside promenade aboard the Disney Treasure may not be well-suited for running, it is an excellent venue for enjoying the ocean air and at least some degree of physical activity. There are even water bottle refill stations/drinking fountains, places for recreation such as shuffleboard, and, of course, wonderful places to sit and relax as you sit on a deck chair reading a book or simply taking in the amazing vibes of your Disney Cruise Line vacation.
If the stairs or non-circuitous nature of the Disney Treasure's shipside promenade aren't conducive to your preferred running style, I hope you can find other ways to keep up your fitness regimen. Naturally, there are treadmills in the Fitness Center. Since that may not work for your needs, I would recommend what my daughter and I did: use the elliptical machines instead. We had a good time with a great view as we worked up a sweat. And having the showers nearby to clean up before our next activity was very convenient. I imagine you will also want to consider participating in the Disney Castaway Cay 5K, where each participant who completes the course can earn an enviable medal.
Thanks again for visiting us at planDisney, Janet. We can't wait to hear from you again. I hope you have a magical cruise!
~Tony