Expedia activities over $55aud. Buy and pay before 30/9/2019. Activity must be used prior to 31/5/2020. Can not be used to book multiple activities.
Excludes the high end major theme parks like Disney and universal studios. Says you must be a resident of Australia.
Here are the restrictions
Can only use once per account. Expedias in other countries may have similar codes and you cam use multiple accounts.
Looks like it might be available on the us site for items over $75usd. SUMMERSAVE25. In case you need multiple deals.