If you plan to go in May, Crested Butte and Durango aren’t going to be great options. With the snow pack this year you’re going to be looking at the Western Slope, Front Range, or one of the crazy places like Salida and Canon City where riding is accessible year round.
Any of the big alpine rides that Colorado is famous for will probably be snowed in until July this year. Three days in Salida though barely scratches the surface of in town and near town riding so that’d be my recommendation if you want to be in the mountains and ride.