Researching cities/towns to relocate?

My girlfriend and I are looking to relocate in 2016 in order to start a life together but we are unsure how to determine the best places to live. Do you have any thoughts as to what resources are available that give a good sense of place as far as cost of living and resident happiness, etc? Any sites, reports or books that would be beneficial in this search?

Our criteria:

- reasonable cost of living (not too expensive)
– Grocery options are reasonable & healthy
– City/town is easily accessible via bicycle
– City is relatively safe
– Agreeable climate
– Healthy arts scene (gf is involved in project management)
– Tech Firms or startups in the area (I am an mechanical engineer)
– Access to outdoor activities within driving distance (hiking, canoeing, etc)
– Residents are involved in the community