The Mysterious Benefactor continues to give and give. Maybe we should send him a Hai Karate gift set? It costs more than Aqua Velva, so he'll know we care. All of the MB's scans are from Frontierland, as usual.
These first two were taken in succession (obviously), just look at that line! I'm actually not entirely sure if this line is for the Keelboats, or the Canoes, or Tom Sawyer Island Rafts, or a combination of those, but it's pretty astonishing to see dozens and dozens of guests patiently waiting.
Just seconds later, the Keelboat has continued onward, honking its "La Cucaracha" horn as it passed. You know the one I mean! Frontierland looks so lush here, though I admit that the slide seems to have a greenish tint.

Next, a raft returns to the mainland, I notice that some makeshift seats were added to so that people wouldn't have to stand for the entire 1-minute voyage. I suppose you can't blame people for resting their feet when they have the opportunity.
Wowee, that is one crowded raft. And there are some pirates aboard to! A portent of things to come. Ah, the pre-Fantasmic island, how I miss it.
This next one is interesting to me, as a Disneyland postcard enthusiast. This photo was taken at nearly the same time as a slightly-different one used for card #C-15, from a series that (according to one website) ran from roughly 1956 to 1966. It's also just a pretty picture, with the puffy clouds (was this taken in January or February?). The raft is the "Becky Thatcher", which I don't seem to see as often as some of the others.
Here's postcard C-15, presumably taken moments later. The raft isn't leaving much of a wake, so I am assuming that it slowly drifted while the photographer fumbled with his camera.
Many thanks to the Mysterious Benefactor!