Alma itself is not the best/most central location, (it's the town South Park is based on, did you know that? Look for Mr. Hanky!). But if you have access to a car, you can do a bunch of great rides.
From Frisco/Dillon (25 miles away) there are several AWESOME options, out-and backs up passes, bike path around the lake, the Copper Triangle route (Copper-Minturn-Leadville-Copper). THe whole I-70 corridor carries a lot of tourist traffic, but Vail Pass is a bike path/car-free road from Copper Mountain to Vail (small climb/big descent then back), Loveland Pass doesn't get a ton of traffic in summer (from Breckenridge take Swan Mtn Road to Keystone then continue East on Hwy 6). The network of paths around the Dillon REservoir would be good for a short/flatter day.
Definitely worth coming out.
edit to add- probably the worst ride in the area is Alma to Breck, in terms of traffic & not much shoulder.