You should be able to find info here on Sphinx, ice palace - they are free - what isn't free is the rail trip tp them which can be very expensive - if you go, make sure it is a clear day - it is very worth the trip. If you have some type of Swiss rail pass, you can get a discount.
As for Trummelbach Fall - take the train from Interlaken East and go to Lauterbrunnen - make sure you get on the correct part of the train as it splits and part goes to Grindelwald and part goes to Lauterbrunnen. At the station in Lauterbrunnen, catch a post bus heading south into the valley and it will take you straight to the falls. You could also walk this but it is a couple kilometers.
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