since there is like 3 frozen lakes i'll tell you. Kill all reavers first. Then slowly cross the lakes(whne you have to choose between left and right choose left)that way when the ice starts to break nad pecies fall you know where to go.
If you still cant do it check the supercheats guide.
-Less Cringey Stuff here -
Avy+Sig done by Cyn check out his Shop in the Graphic-Requests Forum if it still exists.