I fight lost wars, see light, fear sight
I open my mind, need flesh, fear mine
1. Is it the player's choice on where to move? I'm assuming yes (with the exception of if the harp is a tile they can move into).
Yes it's the choice of the player, as long as it's via a legal path.
2. When they arrive on the second tile, do they follow that tile's instructions if they can, or is their turn over as if it's a blank tile? I'm assuming yes, but I was tired last night while reading the rules and must have been continuously skipping over that sentence.
You ignore any actions while being blown 'through' a chamber, but carry out the action as normal for the tile your character finishes on.