Go just past whistler and stop at nairn falls just before pemberton. At the end of the path when you get to the observation area which will be on your left, keep walking ahead and just look right. You will find a gate that says no entry, danger, you will die etc. Take them seriously, but if you feel like it, hop it and climb up the hill AWAY from the waterfall. Up at the top of the hill there is a big wide open area where you can chill out at the top of the falls. STAY THE FUCK AWAY FROM THE EDGE, but there is tons of room up top with the most amazing view while still being safe. I believe it it CP Rail property, so technically you could get in shit, but its pretty much one of the most beautiful sights you will see in your life. Heres the sign.
Top of the falls
Heres looking down but it doesn't really do it justice
Heres the river before the falls
