Make it accessible and simple. It will benefit your caretaker and your Sunshines :) Your caretaker will not miss doing it if it is simple to do. The Sunshines will want to step out earlier and more often when they don't have to go through a maze to find that door.
It is very important that they have easy access to the range outside. That is where they go hunting for their food. That is where they get their exercise and develop their lean bodies.
Pick a design that will work for you. Depending on the materials used for your housing, there may be easier ways to do it.