Couple of tips for you.
- AC will give you the tourist card for Cuba either at the check-in or gate at YYZ or on board the aircraft. I wouldn't worry about the "lounge" in Havana - not worth the time or trouble!
- If you're going to any point in the U.S. after Cuba, don't take anything purchased in Cuba (even something as innocent as a "Hola from Habana" postcard) with you. If they search your bags (and with a Cuban stamp in the passport they'll know you've been there) they will confiscate anything connected with Cuba as no "imports" of Cuban goods are permitted. They have no issue with you, as a non-U.S. national being there, just an issue with breaking importation rules.
- On AC's 777 between Sydney and Toronto (if you're going all the way through on AC34) the individual suites they have in J can make it hard for travelling as a couple or family.
Some people prefer side by side 1 behind the other but there is a wall seperating you and when seated, it's hard to see the other person. The 2 suites in the centre of the cabin do have a partition between the 2 suites that you can move down but as the seats are angled away from each other due to the herringbone pattern, you would have to turn 180 degrees to look at/talk to each other.
Most have found that one on the window and one in the centre across the aisle works best. You can at least have eye contact and if you can learn sign language before you fly, you can communicate!
Be aware though that the rows are zig-zagged - if you are in window suite 5K, partner needs to be in centre Suite 6G as example.
Try and avoid rows 5-8 if you can. There is a stand-up bar between rows 6 and 7 plus a lav on each side, so it gets busy and possibly noisy in that area during the flight.
If it's the 1.30pm departure, don't eat too much lunch before boarding. They have a big luncheon service - takes a good 90 minutes or more to get through it all and is more like a bistro service. Course by course rather than a plonked down tray with the main coming out after you've demolished the starter that was on the tray.
- Same applies for the Toronto-Paris leg. If operated by a 763, it's only 3 single suites across, so get a centre and right side window preallocated. AC call centre in Sydney are happy to do it if your agent hasn 't/can't.
- The Toronto-Havana flight is operated with E-jets, so they will be "domestic" style Business cabin/seating. AC treats most of the 25+ Carribbean ports it serves as part of it's extended domestic network, so no full International service/cabins.
- On arrival in Vancouver, if you are going all the way through to Toronto on AC34 grab a shower in the Maple Leaf Lounge during the transit. You should be able to get through immigration fairly quickly at that time of the morning - especially as you'll be amongst the first in line coming out of the J cabin. Just don't spend too much time at the waterfall hugging and kissing the totem pole on the way through!
- You will find a similar forum on flyertalk.com. Not as "local" as this one, but very similar format/style and a wealth of information on all manner of travel related things, principally including the FF schemes.
Cheers and have a great trip.