Tips
For your stay between May and October, I recommend purchasing a Salzburger Land Card. These are available for 6 or 12 days, e.g. at the tourist office in the village center or online. http://www.salzburgerland.com/de/salzburgerlandcard/index.html
You get free entry or transport to 190 attractions, whereby the use of the listed cable cars and a day in Salzburg with a visit to the Hohensalzburg Fortress quickly amortizes the costs.
Included are e.g.
Karbachalm Cable Car
Salzach Gorge
Not all sights are included, however. Unfortunately, the Eisriesenwelt with the largest ice cave in the world at Werfen is not included.
Nevertheless, I recommend a visit.