Like the first answer said, Eldora is near Boulder, not so close to the others...Loveland is right off the highway, so it can be pretty busy sometimes. Also it is usually pretty windy there which can be very painful as you near the top of the lift (it kicks up the snow and feels like you are getting little rocks thrown in your face. Winterpark is a very nice resort, very big, lots of skill levels. Can be very busy as well, and crowded on some of the runs. It also has a tubing hill and terrain park. I would pick Winterpark if I were in your situation, the drive can be daunting though so if the weather is bad when you are here, you might be better off with loveland.
winter park.eldora is near boulder, not near the other resorts. Its ok if you only want to go for half day or are staying close to boulder.Loveland is boring IMO. winter park is nice. out of those 3, I wouldn t go to any. I would go to Breckenridge or Copper Mnt.
Winter Park! The slopes are so much more fun, mostly because of how much more difficult they are. But, Winter Park has extreamly long lines, Loveland, on the other hand, not so much.