Cancelling west coast trip... any tips on planning for NL instead??

My husband and I, along with our 8yo, have bailed on our long-planned trip from BC down the coast through Oregon (a bucket list spot for me and my husband) and ending up at Disneyland, then back up through Portland etc. It was supposed to be a 2.5 week trip in September but everything is officially cancelled and we're starting fresh. (No, our 8yo didn't know about the Disney part! So he's happy to stay in Canada.)

So we're thinking of doing 2-3 weeks in NL instead in September. Going from Vancouver it's a bit pricey but we're all really excited about the idea. I'd love to hear any MUST SEE towns/sites! We love anything outdoorsy, architecture, good food, local live music, museums/history, etc. We'll be renting a car but would be flying into St. John's. Thanks for any suggestions!