diseverestfan & MrsJ Henry -- Maybe these photos will help:
This is the Bay Lake side of the Tower. At the extreme left side of the photo you can see the edge of the Garden Wing. Then there are 2 sets of stairs flanking the ground level entrance to the Tower. That entrance (in the middle of the tower, the same one Tower CR guests use to access the pool, beach & dock) takes you to the ground level where the elevators, escalators, registration desks, and the new restaurant The Wave are located. Take the escalators or elevators to the 4th floor for the shops, arcade, and Chef Mickey's.
If you took the outside steps (shown in the photo) you'd enter the tower on the 2nd level, which is where the desk for the California Grill is and mostly the convention people go (but all are allowed to enter there as well). You can catch the escalator up to the 4th floor (Concourse level) from this level.
The photo below was taken standing under the stairs farthest from the camera in the above photo. The lady pushing the stroller has just exited the Garden Wing and the door is no more than 15 feet behind her, but it is around a corner and doesn't show in this photo. The entrance door to the Tower is about 20 feet behind where I was standing when I took this photo. As you can see, not a long walk at all, and it is covered so in the Florida rains you can move back and forth without getting soaked.
I hope this helps.