We could do that but we really want the Mouse.
Budget estimated between 6000 and 7000$ for 4 people.
I just got back. I wasn't going to bother posting but I think many of the suggestions are wrong. You can't do HI and think budget. Add Aulani and budget is out the window. You can plan for a great vacation. You can do things which give value. You can't get cheap, it's hard to even get reasonable.
You want to visit Vancouver. Have you considered an Alaska cruise? Fly into Vancouver a day or two before your cruise. Cruises from Vancouver are superior to cruises out of Seattle.
You want HI. Do you charge a lot on credit cards? You might try to get a reward card and hope to get free tickets for at least some of your group.
Airfare is going to cost $3500-$4000 for the 4 of you. Half your "budget" That's why many of us wouldn't plan a 5 night HI vacation. Too much of your money is going to airfare.
Are you planning on putting all 4 guests in one hotel room? There is an extra charge for more then 2 adults in the room. 5 nights with transfers could cost as much as 3314 for 5 nights. I booked Aulani through COSTCO during their promotion after Thanksgiving. I think 5 nights in a studio, 2 of us, was around $2100. You needed 5 nights to get the promotion. Renting points avoids the extra adult charges. Renting points 5 nights in September should cost around 1500 in a studio and around $3000 in a one bedroom. Rent points 11 months out and you'll pay a premium Wait until inside 7 months you won't pay the premium but the lower cost views may not be available. Renting points requires finding travel insurance which covers your needs. You'll probably have to buy it when you make your first deposit.
Your budget is basically gone with your flights and room. Nothing for tours. Nothing for food.
Car rental. PP are crazy. A newly licensed, or newly re licensed driver shouldn't be driving an unfamiliar car in an unfamiliar area while sightseeing.
Suggestion. Go to Disney's site price Aulani for 4 and for 5 nights. Best case scenario would be a 30% discount. Discount might be some combination of discount, resort credit and extras. Make sure you list 4 adults. Even with an assumed, not guaranteed, discount you'll probably be above your budget.
A few nights in Waikiki? Most hotels in HI, Disney is the exception, add a resort fee of $30-$50 /night. You'll also have to add extra ground transportation. You'll lose almost a day in the process. I wouldn't do a split stay for 5 nights.
At a minimum you'll want to book an around the island tour. You can book a bus tour through Disney. For 4 people I'd spend the extra and price a private van tour. Google and get prices from a couple of licensed operators. You'll review your options. You'll stop when you want and for how long you want. No hour stop in a tourist trap gift store/restaurant/attraction.
"Budget" ideas. There is a twice hourly free shuttle that will get you to the shopping center and I think other resorts. It's walk able but you have a free alternative. There is a breakfast type restaurant opening in the shopping center. I don't remember the exact name Eggs Everything or Eggs Etc.
Ulu cafe in Aulani offered a pick 4 combo for breakfast. Scrambled eggs, bacon, breakfast potatoes, french toast....For my pick 4 I asked for double eggs and double french toast. I have no idea if that's normally allowed or if the CM was being nice. More then enough for 2 to share, maybe enough for 3.
In budgeting assume HI in general, Aulani specifically, will cost about double what you normally spend. Decide if you want to take one $$$ vacation or 2 "ordinary" vacations.
You want a real "deal" Owners who need to cancel their timeshare vacation at the last minute frequently dump weeks on ebay and redweek. Your best deals are with 60, and maybe even within 30 days. Frequently great deals at the Marriott next to Aulani. You'll need to book the entire week but you'll still have a great deal if only stay 6 nights.