To get to Injun Joe's cave, go into Big Thunder Mt room. Go into middle mine door (on lower level). You will come out of the right mine door (one level up) in the same room. Now, turn around and go back into the door you just came out of. Presto, you are in the top right doorway of Injun Joe's cave!
Go to the waterfall (look for QUEUE) and slide down. You are now in Big Thunder Mt. Mine, top level, middle entrance. Go to the right and Exit. You will end up in the same room, on the middle level, right side. Turn around and go out the entrance you just came in. Now you are in one of the places where you can answer the constant question, "Hey, how did you get up there?"
To get to the top left of Tom Sawyer's Island, get to the top level of Big Thunder Mt (see previous post) and go into the shack.
You will be at the top of the slide in the Big Thunder Mt Mine. Slide down to the lower level and exit on the left side.
And there you are! You are across the river from folks who took the monorail.
Now you can get the horseshoe