Step1:get a skylander.step2:look on the green,yellow or blue part on the bottem.step3:there should be little writing on it look at that what ever it is that is the secret code to only that skylander.(these are on spyro's adventure,giants and swap force.)
There is an apple tree at the Ruins which is guarded by a sheep. Shoot the sheep and wait for an apple to drop from the tree, then walk towards it so your Skylander eats it. A gem will appear in the tree which is worth 1 or 10 coins. Shoot the tree so the gem falls down. Avoid the sheep afterwards or it will try and ram you.