Until Covid is no longer a global crisis, there will not be special ticketed events.
One possible solution for tickets is this special offer:
https://disneyworld.disney.go.com/special-offers/2-extra-ticket-days/
inside the parks, it’s mostly about rides, food and shopping right now. This might be cheesy, but a lot of dark rides have fireworks finales, which in a way is more fun than the actual fireworks shows. They’re a private, uncrowded show

. Also, they may not have the long Magic Kingdom parade, but all 4 parks have the character cavalcades. These are great as you don’t have to stake out a place far in advance and deal with crowded streets after. And personal character meets may be off, but in most parks right now, you can interact with characters in a whole new way. Epcot is especially good at this, between figment ride and the land, there’s a grassy area where the characters have lots of socially distanced fun. Need to get a little closer, try a character meal. Theyre socially distanced but still fun. If you have time the morning you leave town/check out, I highly recommend Topolinos breakfast. The food is amazingly delicious and character interactions are a lot of fun, even if they’re not right at your table. We did 4 character meals. All were different, but still fun.
Beyond the parks, fun enough is subjective. You mentioned boardwalk, make sure you know what is and isn’t available there right now. I know a lot of dining is unavailable, just not sure about the shops. For Disney Springs, if you go, make it during the week and get there early. Weekends and evenings get crowded. If they absolutely don’t want to do the parks, Look for a list of resort activities that are available along with the list you mentioned and see which activities you all want to do. See if there’s anything they want to do, like go to the ocean or take the skyliner to Hollywood Studios and grab a bus to Animal Kingdom lodge Jambo House and sit out on the animal viewing area and watch the animals for awhile, or just enjoy a day at the resort pool. There’s definitely no shortage of things to do. Just make sure everyone is aware of the itinerary going in. Don’t want the kids thinking they’re going to all the parks when the adults decide maybe just one park this time.
https://disneyworld.disney.go.com/recreation/
this is a list of all resort recreation. Some items show temporarily unavailable on the main page, others might say it elsewhere, I’d recommend verifying something is available before deciding on doing it.
hope you all have a great trip!