Mining
You should store some colored grass especially on summer for the indigo, blue and purple grass, winter for white grass and digging in the mines to find black grass. You should also buy from the casino a truth bangle to know how much stamina you have left and fatigue you have gain.
If you have a kitchen you should cook foods with good recovery, there's a list here:
http://fogu.com/hm6/chan5/mine_descent.php?p=y
On the 3rd and 4th mine you should save often and your stamina always full and 0 fatigue when falling in a hole, because you could pass out easily.
On the 2nd mine you should do the save and reload trick, for example you found a hole, then you saved and went into the hole and the room is big or you landed on a floor with 0s at the end you should reload and try again.
If you have a kitchen you should cook foods with good recovery, there's a list here:
http://fogu.com/hm6/chan5/mine_descent.php?p=y
On the 3rd and 4th mine you should save often and your stamina always full and 0 fatigue when falling in a hole, because you could pass out easily.
On the 2nd mine you should do the save and reload trick, for example you found a hole, then you saved and went into the hole and the room is big or you landed on a floor with 0s at the end you should reload and try again.