basically Towers can refer to any building in the Tower courtyard (lazy river side of the hotel)
buildings include Continental, Americana, Bayside and Beachside (the last 2 not being displayed on the map above, but they're at the end of Americana and Continental buildings)
The assumption that rooms there are closer to transportation and food court may not always be true
if you're at the far end of the tower buildings, you'll be farther away from the food court and possibly transportation, than if you were at the far end of the courtyard buildings
but, on average, a tower room could limit the amount of walking.
there is no way to guarantee a room that's close to transportation and food court.
you still can contact the resort and make requests, which cannot be guaranteed, but it doesn't hurt to try.