I've never stayed at a Disney resort. We tend to make our vacations more about the general location than the resort. So I research things in the area that I think would interest my family.
One year I found a state park near our resort was having an awesome grunion fish egg hatching and release experience. My son loved it!
At this very moment I'm hanging out at a skatepark in Southern California while my son skateboards. Simple things like this are fun because it's just so hot in Vegas right now that the only mid-day outdoor activity you can do is swim. This is fun and exciting to him. We will spend time at the beach and walking around town looking at things or getting treats. Laid back can be very family-friendly
Ps - Vegas can be very family-friendly if you want it to be. It's all about keeping the adults in the group away from gambling or partying. Roller coasters, indoor skydiving, tram rides, gondola, ice skating, pools, water parks, hiking, rock climbing, skiing, Hoover dam tour, lake mead boating, children's museum, lots of great parks, springs preserve, wetlands park, natural history museum, old Mormon fort, neon museum, Ethel Ms chocolate factory, Skyzone and Gravady, free outdoor movies at Downtown Summerlin or The District or Town Square, go cart racing, mini golf, high roller, etc etc etc