Currently the area for Camp Mather resort: way/416229165 overlaps this section of land where the Evergreen Lodge is located. Per parcel tax maps of the area: https://www.tuolumnecounty.ca.gov/385/GIS it does seem that Evergreen Lodge may not be part of Camp Mather and instead the boundary for Camp Mather should be updated to only extend as far south as the path here: way/423200533 and the stair step area south of the path should instead have a new area created just for the resort at Evergreen Lodge.

there are more cross country piste trails that are missing that can be added here via: https://www.mammothmountain.com/winter-activities/cross-country-skiing/tamarack-trail-status-conditions

should add winter_service=no to this section of Old Mammoth Road as its closed to vehicles in the winter when snow is not removed. Its unclear where the actual closure gates start and end though.

Rock Creek Road is closed seasonally in the winter to vehicles via https://monocounty.ca.gov/roads/page/county-road-closures . Suggest tagging road starting at gate closure "winter_service=no" via winter_service=*

town boundaries here look offset, someone with knowledge of the boundary please feel free to fix

seems like the node for Country Knolls should not be tagged as a "town": node/158836163. The area for it is a CDP and its tagged correctly here as a CDP: relation/176295. Unclear what the best way to tag the node would be if it makes sense to change it.

latest imagery suggest the runway for this airport: node/369161597 is no longer here or being maintained (looks overgrown), if this is the case then the poi should be removed or marked as abandoned. Verification needed.

air field may be in incorrect location, it might in fact be the linear clearing just to the south east of here

name of school has changed I think, verification is needed