Sorry, I'm not really sure. What is a hidden cave? Does it have something to do with World Adventures? If it does, I doubt there would be one in Appaloosa Plains.
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Go through the geyser and into the cave, then shoot Tio Millonetis
They are buried in the forest. Look in the hidden cave nearby the lot on the bottom right corner of your map.
you use the llama crown on the door with a round hole in it in the dark cave to enter the hidden lagoon
you have to get to the hidden lagoon in order to pass it. first you have to find the llama king's crown in the temple interior. then you go to the dark cave and use the crown to open the door there which will take you to the hidden lagoon. next just look for the floating footprints to go to the other end of the quicksand in the east river plains. finally just knock down the left pillar and you can travel in and out of the lagoon and river plains.
On Sims 2 Ds The Rat Cave is in the Basement in the Large Blue and Grey Doors by the Freezer. The doors look like lockers (hidden) and will open automatically if you walk up to them.