Just want to say that :
1. Seems you only spare one day for LAS + Grand Canyon, I think you need at least 2-3 days there. You can join a local tour in LAS for Grand Canyon and Hoover Dam. Also, there are a lot of nice Hotels and Casino for you to look around in LAS
2. Are you flying back to HKG from Toronto also, if you can get a ticket HKG/Toronto & Vancouver/HKG, then you can save sometime in flying and spare an extra day in Vancouver before you fly out too
3. If your trips are flexible, you may also check on the website the tickets for your trip and see if there are stopover/transit required. Say for example, from LAS to Vancouver, if you need to transit via SFO, then you may also stay for 1 night to see
Just some rough idea for your ref.
