OK, I'm probably going to get some bad reviews for this, but I have to tell my story - it's been eating me up inside since this happened to me, and I had read this thread before my trip, never expecting to contribute....but I must now.
We were on Sunrise Safari (via AKL Concierge), and I had too much coffee to drink that morning, since we awoke at 6am for the early AM safari tour. As we were about to embark on the truck ride, I had to go (#1) so badly that I asked the safari guide if there was a restroom. He said there wasn't one nearby, but could see that I was in a state of dire need and extreme discomfort, only minutes from getting on one of the bumpiest truck rides, for two to three times as long a duration as the typical AK safari (about a one hour safari). So he said to go back out thru the waiting coral, head up the pathway, around a bend, and find a tree. He said this is the only way I could go because the nearest bathroom is more than a 5 minute walk one-way into the AK main park, and the truck is about to pull up to take all of us, and they were on a tight schedule.
Although slightly off-topic, since it's not technically a bathroom, in a pinch, this became the most important and best bathroom in all of wdw.
And really, there is no bathroom facility available to anyone from the moment you start on Sunrise Safari at AKL - let this be a good early warning to those of you who will do SS. You spend about 20 minutes on a bus ride through the backlot where the animals are tended to, and then pull up to a backside entrance for the AK safari truck ride - a very interesting way to enter AK and the safari waiting area that I never even knew the pathway existed. In other words, you come in the backway and never step foot in AK or go by a restroom, and are rushed immediately onto the awaiting safari trucks, so that you can have time for a long tour while the animals are being fed (much better than the typical AK safari ride, and a real live guide talking and answering questions).
An hour and a half with a coffee filled bladder isn't comfortable, and I was about to quit the sunrise safari, but he gave me the go-ahead, and SS was a once in a lifetime opportunity. Please forgive me, but I had to get this one off of my, uh, chest.