Treasure:
Go to the kitchen in the scumm bar, get the pot. Go to the circus, use the pot as a helmet. You'll be given over 300 pieces of eight. Go to town, talk to the homo with the big ol' jacket across from the three guys with the mouse. Buy a map off him. Look at the map, it'll have dance routine. This route is actually directions to the treasure, but first you need a shovel.
Go buy a shovel from the store near the church one screen above the street with the three circus pirates.
Now head to the forest, look at the map. It should say...iirc: something, right, left, left, right, something, right, left, something or some shit. Follow those directions and you'll find the treasure spot. Dig it up with the shovel.
Idol:
While in the forest for the treasure you should see yellow plant, pick it up. Go to the scumm bar and pick up the meat on the table in the kitchen. Mix the yellow flower with the meat. This will let you get past the dogs and get inside the mansion. Go inside and watch the overly long scene. You'll need a nail file.
Head to the prison and speak to the prisoner. At first you won't be able to talk to him because his breath smells like black mage's doo doo in his pants, so go to the store talk to the owner and ask for mints. He'll sell you them for 1 piece of eight.
Give the mints to the prisoner, ask about a nail file. He'll say he doesn't have one but welp, whatever. He's got a carrot cake but being that he's a faggo he doesn't like carrot cake (wtf). He says he'll give you the carrot cake if you get rid of the rats. To get rid of the rats use the gofer repellent you find in the mansion. Give it to him and he'll give you the cake. Open the cake and you'll have the nail file. Go inside the hole in the mansion to finish that scene.
Enjoy.