Mission Ridge is about a 3 hour drive from Seattle but it usually has the best carving conditions and the least crowded runs: https://www.missionridge.com/trail-map
Crystal Mountain is great resort with a nice variety of terrain: https://www.crystalmountainresort.com/the-mountain/mountain-report/trail-maps/
Stevens Pass is also a good resort: https://www.stevenspass.com/site/mountain/maps/trail-map
The Summit at Snoqualmie (the closest to Seattle) has 4 areas, 3 are easy (Summit West, Summit Central, Summit East) then there's Alpental, which has awesome steep runs and great backcountry terrain: https://summitatsnoqualmie.com/maps
Stevens Pass and The Summit at Snoqualmie have good night skiing/riding.
There's also Mt Baker (if you're up for the drive): https://www.mtbaker.us/ski-area-info/trail-map