I have done this twice, since I find it good value. I can attest that it works. I think it's best value when you book a single night and have multiple people eg. 4 people sharing 1 room.
You book a room that says '+ Entry to 3 Theme Parks' eg. Resort Room + Entry to 3 Theme Parks.
This package includes unlimited entry to Sea World, Warner Bros. Movie World and Wet 'n' Wild Water World - That's to be used on your day of check-in, plus through to and including the day of check-out.
So you arrive to Sea World resort early on your check-in day eg. 10:00am. They'll give you the theme park tickets at the counter. You can't go into your room until it's prepared later, so you leave your bags in the car, then jump onto the monorail to Sea World for the day.
Come back to the resort in the afternoon. Room service, dinner and buffets there are a bit pricey. So bring food or drive to another restaurant if looking to save money. The buffet asked if we had a special, which we didn't, so I expect there are some specials available like BOGOF buffet on Shop-a-dockets, or maybe they meant another booking site having a room + buffet special. Friday/Saturday are Seafood nights at the buffet, so cost more.
Booking.com let me select a room with buffet breakfast for only $20 more for our 4 people. If was $20 extra for the whole room, not per person, so very cheap.
Following day you wake up, eat the buffet breakfast, check-out then drive to Movie World or Wet'N'Wild for the day.
We had 3 adults + 1 Child and all up I paid $284 minus 4% CashRewards Booking.com cashback for 'Resort Queen Room + Entry to 3 Theme Parks'. Including:
Sea World for 1 day.
Resort for 1 night.
Movie World for 1 day.
(You could swap the Movie World for Wet'N'Wild. I wouldn't swap Sea World, since that would be inconvenient with extra driving.)
To buy the theme park tickets alone would cost us a lot more. Eg. $129.00 for a 3 day park pass for 1 adult. No resort, no buffet breakfast and for only 1 adult. Multiply by 4 people.
* Bring a hat
* Bring snacks/food to the theme parks if looking to save money.
* Prices will vary depending on date. Ours was $284 on 5 April (Friday night) while 1 May only has 'Resort Room + Entry to 3 Theme Parks' for $385 or $425 including breakfast. You might have to be flexible with dates.
* The height limits for the medium-sized rides is usually 110cm+. Kids under 110cm will be on the kids rides.
Seaworld Drive, Main Beach, 4217 Gold Coast, QLD Australia