Must be summer already...
Leave the trees in. good to separate terrain types. what is good "terrain" for some is not so for others... For instance... Expert terrain...steeps and off piste (including hike-to and back country access), groomers (some people like them), Bumps, beginner/intermediate terrain, parks and pipe.
Ski school should be separate from other services.
How about listing categories alphabetically so there's no implied priority.
accessibility. Not as in airport or parking, but for skiers w/disabilities. maybe a subcategory under services or ski school?
hard to make crowds/lift lines and lifts the same. Some of the least crowded resorts have the creakiest lifts. Some care about the line, some actually care if they are detachable high speed wonders. Mabye on-mountain amenities, including lifts and lodges one category and then crowds - or lack thereof another.
good idea to not do an overall score. So people only rate those things they actually know and care about. Fox had good idea for reviewer to indicate how well they know the resort they are reviewing. Maybe not count how often one's been, but first timer, devotee or local category could weight the review?