I've read in other threads - and my guidebook states -
"Access to this resort has been restricted in the past, but now offers the same level of security as other Disney resort hotels."
I think if you drive up and tell them you are interested in staying there, and want to look around the resort before you make your decision, they will issue you a 3-hour parking pass and allow you in. I've read where people have done this without a problem. As with all things - common sense rules. If you decide to go check them out on a busy Thanksgiving Day around dinner time - then you might not get in, simply because they might need the parking spots for dining and resort guests. But, if you are checking them out on a slow day during the middle of the afternoon, then they will probably issue you a pass and let you check out the resort.
To be absolutely safe - doing what the previous poster suggested and using internal transportation would get you in the door without a problem.