A number of new breweries have opened right in Loveland (Grimm Bros?...but I haven't been to any of them), but yes, you can't go 50 miles in any direction without hitting many....
North (fort collins): Coopersmiths, New Belgium, Odell's, FtCollins, Pateros Creek, A-B (go for the draft horses/free tour), Funkwerks, and probably more that I can't think of....there are some that are coming on line any time now....
South: (Longmont) Oskar Blues, Left Hand, Pumphouse
East: (Greeley) Crabtree
West: Estes Park
Southwest (Boulder): Avery, Boulder, Walnut, Mountain Sun....and many, many more:
South south west (Golden): Golden City Brewery, Coor's (free tour)
Feeling randy? (far south in downtown and Lower Downtown (many in walking distance of each other)Denver...45 minutes +/-): Great Divide, Wynkoop, River North, Denver Beer, Prost, Trve, Rock Bottom, Pint's, Chop House, Brekenridge, Strange, Renegade, Wit's end, vine street....(and that doesn't count the ones between boulder and Denver, and the ones in south denver suburbs.
Bring an extra Liver and count on some sick days (or vacation days if you can swing it)...you have a lot of work to do.