SPOILER HELP: I can't seem to get the second secret- I think I already got the key out of sequence (I opened the chest in the map), and I've played a LOT of coin flip games. Nothing about a key.
There is 2 keys in the map, but one of them is a red haring. On the right-side of the map, between trees you find 3 stones on the ground that's the location for the right key.