@fstuff1 Ooooh! You're on Solstice!🙂 I'm going to have some questions for you about the North Queensland stops on your itinerary. They are the same as Celebrity Edge next year.
I'm really sorry but my honest opinion is even on a Saturday, I'm not sure it's doable if your "arrival" time is 8am. I'll explain why below.
The things working against you is check-in and boarding for Miramar is 8:45am for 9am departure. The walk off the Ship along the gangway to the front of the cruise terminal, is approximately a 300 metre walk. Then you have to grab a taxi or rideshare. Once you're in the car, on a Saturday morning the travel time estimate is 28 to 35 minutes from the Brisbane International Cruise Terminal to the Southbank location of Miramar's Wharf. And then you also have to factor a short-ish walk down to the departure wharf from your drop off point. That's an awful lot to do in less than an hour. 😐
My recommendation for the easiest way to do Lone Pine yourself, is book a driver and have them waiting to pick you up and take you direct to Lone Pine then pick you up when you want to go back to the ship. That's what one group is doing on my Celebrity Edge cruise. I have a family friend who is an Uber Driver and he is booked to do exactly this.
Another group from my Cruise has booked a shuttle bus service that I found. The company is a local private transport provider in my area and I put their details up in my Roll Call. So far one mini bus of 11 passengers is fully booked and they are selling a second one. I can put in contact with either of those options if you'd like. Once you have transport arranged, then you just have to buy your entry ticket online.
As for $25 for a Koala photo... Sure if you like. I do the Animal Encounters at Australia Zoo and what I like about those experiences is you get to go behind the scenes and learn more about the animal's care. Also, funds raised go towards conservation work. So I think it's good to do those kinds of encounters.
I hope that information helps. I feel really bad because the Miramar Cruise is a fabulous way to go to Lone Pine and back. It's just these bloody Cruise ship timings don't make it easy for people to organise their own plans.