I'm sure no one will have an issue getting rid of their Dining vouchers but the Discovery vouchers are a bit harder to find a good use for. Personally I have very little free time at the moment and almost none before the end of June that I can do some travel to use them.
The following are two suggestions that have been mentioned in other Ozbargain posts but I'm sure there a heap of other good ideas.
Rouse Hill Town Centre
Basically you get a movie ticket (with popcorn), choctop, timezone voucher and a meal. Expires end November 2021
Hoyts Movie Voucher
2 x standard movies or 1 x lux movie. Expires 3 years.
Some Captain Cook Cruise options:
Some other non cruise options: