The Carinthia Card, which is in your room rate included, is valid from April to the beginning of November and can be used as often as you like during your holiday.
It offers you free entry to more than 100 destinations throughout Carinthia, like for example:

• free use from cable cars
• panoramic mountain roads
• water adventures
• museums
• boat trips on the lakes

You can find a detailed selection of excursion destinations and further information here:
Summer: https://www.kaerntencard.at/sommer/en/destinations/