Steamboat, CO is where my kids learnt to ski. Great learner/ blue slopes and great hotel/ American eateries made a great holiday. No queues, plenty of space and none of the crowded pushing in I’ve seen in France/Italy ;(. If no learners, then it can be a bit ‘small’ ( if it is possible to use that word in USA/Colorado!) and tame. Other places nearby are great for intermediate +.