IMO the easiest solution is lifting masking when moving about outside and on attractions that are outside/have outside queues. Examples would be Jungle Cruise, Safari, Tea Cups, Barnstormer, ect. My understanding is that outside activities have very little risk of infecting people even if they are not vaccinated. Things like Buses, boats, ride portion of Spaceship Earth, Small World, Pan, Pirates ect. would still require them. You put a cast member at the front of the attraction letting people know they need to put their mask on for this. Sell it as saving the children and you have a workable solution. Rides that have queues or track that move both inside and outside become a little harder to make these decisions (Splash and Everest come to mind) of what's a mask ride and what's a maskless ride.