You seem to still be at the start. The Spoiler (mouse over to reveal):gardian is at the isle of mists and the tower isn't on an island. You'll know when you get there.
Spoiler (mouse over to reveal):The gardian IS the crow, once you get rid of his colored eyesSpoiler (mouse over to reveal):The tower is in a dream, you cannot see it until you are in that dreamYou don't need to look for places, everything is pretty straightforward (I think)
Spoiler (mouse over to reveal):the red tile is in the castle. You can read the hints about distracting the guard dogs