Apr 20, 2012 - 11:25 AM
If you can manage to follow your plan (Schüpfheim - Sörenberg - Giswil), you can reach Meiringen shortly after noon.
If you are into a hike I would suggest you go by bus to Rosenlaui, visit the Rosenlaui gorge and walk back to the upper entrance of the Reichenbach falls. Visit the falls and go down using the funicular if you like. Then, decide whether there's enough time left to visit the Aare Gorge (it's not too far from the valley station of the Reichenbach falls).
I wouldn't mind to be there if weather conditions are not too good. Whatever the weather may be, the Rosenlaui gorge and the Aare gorge are always wet (just wear proper clothing/shoes), but they are completely safe!
Have a nice hike!