You can take bus or train from Zell am See to Krimml (you can buy the ticket in the train, € 9,90 including the bus to the waterfall, weekend special € 19 for up to 3 People. The Train is every hour about 1.25 hours, the bus is a Little faster but only every second hour.
You can go from Kitzbühel and from Lienz with a Change of bus in Mittersill to Krimml.
You can also go by bus to Königsleiten and with a different bus on to Gerlos and Mayrhofen in the Zillertal, Tirol. The buses are not connected and you might have to wait some time in Königsleiten!
Buses have luggage space, bicycle is € 2,50 extra.
Accomodation in Krimml:
http://www.krimml.at/en/krimml/sommer/start_sommer.html?PHPSESSID=b417463402295f45649183a349f062a5 (click on Rooms for hotels in Krimml)
We travelled to Krimml from the Tyrol region into the Salzburg region - a fairly long bus journey. I was kept well entertained watching the live video link of the road ahead. The journey takes you through the Gerlos Alpenstrabbe - a beautiful, scenic route through the countryside. Our coach tour which we booked through our hotel cost 30 euros for an adult ticket and 15 euros for children. The coaches are very modern, comfortable and air conditioned
When you want to see the majestic Krimmler waterfalls up close but you can't (or don't feel like) walking the scenic Wasserfallweg, you can "cheat" a bit !
All along the main road you can find these mini-buses that take you up to Gasthof Schönangerl of even further if you want. We've used this service once to get to the Krimmler Tauernhau, which is quite a long walk into the valley above.
The taxis take you through the woods on a alpine road that is closed to all public traffic.
One of the providers of this service is the Krimmler Tauernhaus.
Once you reach the entrance of Krimml Waterfalls, the only way to explore it's beauty is by walking (there are no cable cars or ski-lifts there). Take your time and enjoy the scenery because it is very beautiful. The route is well paved, clearly marked and slightly steep at some places (see photos) with many benches along the way. The waterfalls are divided into the lower falls, middle falls and upper falls and it takes about 4 hours to reach the top, so you should decide how much you want to see (anyway, the most beautiful falls are at the lower falls).
One of the best ways to get to Krimml Waterfalls is by comfortable air-conditioned bus of the Austrian OBB Postbus service. There is a regular OBB Postbus (Number 670) which runs from the town of Zell Am See (the bus stop is just across the road to the Zell Am See train station) through very beautiful scenery (please see my travelogue for photos) to Krimml Falls and back on an hourly basis. More information about the bus schedule is at the Postbus website below. The bus journey takes about 1.5 hours and the cost is about 16.80 Euros per person return ticket. The bus number 670 schedule can be obtained from your accomodation if you are staying at Zell Am See.