Having traveled pretty extensively (over 30 countries, several for 3-6 months plus at a time), and having thought for years about the "best place to relocate to" I agree that Whistler is a pretty solid option, except for the damn winters (and the damn tourists, and the damn cost of living). NZ is near the top of my list for non-tropical locations. Australia is not bad. Thailand is up there for tropical locations, but language and property ownership restrictions are a consideration. In BC the Slocan, Kooteneys and Vancouver Island are pretty sweet, but maybe don't have the same amenities as Sea to Sky/Lower Mainland. Parts of Europe (closer to the Mediterranean) can be nice.
I suggest that you think about what is truly important to you. Climate? (BC is a bit down the list here, but probably the best option in Canada). English speaking? (If you move to a country that is not, the kids will adapt pretty quickly, but the adults will probably take longer) Safety? (Depending on your definition, this one could eliminate quite a bit of territory. Most of Mexico, large parts of Central and South America, some parts of US, even some parts of BC, etc.) Recreational activities? (Other than perhaps Colorado/NM/Utah/etc. BC/Whistler will be pretty tough to beat) Proximity to family? (Living abroad can be a big strain if you want to maintain close contact with parents, siblings, etc.) Level of development? Social and political considerations? (Red State vs. Blue State, social safety net, education, health care, socio-economic stability, etc.) Presence of ex-pat English speaking or North American community? Cultural considerations? Business opportunities? (The money you have may not last forever).
Once you have identified some priorities, start to narrow down the list, and then go for a visit. And I don't mean for a week or two. Spend 6-8 weeks minimum (better yet 3-4 months), Get past the "gee, this place is paradise" first impressions. Meet and get to talk with the locals. Find out from them what the worst and best things about living there are. Ask about crime, poverty, stability, politics, cost of living, education, etc. Find out how they feel about outsiders with lots of money coming to live with them (will you be a welcome addition to the community, or a target for robbery or violence?).
Another option is to be "homeless" for a while and travel the world. I've had several year-long trips where I lived and travelled in a region (Western Europe, Thailand/Malaysia, Australia/NZ, India), and I believe that they were the best experiences of my life. Set up a base of operations for a month or three in a central location, arrange for home-schooling for the kids, and see the country (countries) from a different perspective than the average tourist. You and your family will get a great appreciation for how other parts of the world live, and you (and they) will probably come to realize what a great and fortunate life we live in Canada.
(Note that a lot of these options will have to wait until Covid subsides)
Best of luck!!!