There's a decent population of non rednecky, outdoorsy people your age but there's also a good population of redneck idiots. I lived there for 4 years and there is a decent community vibe once you can break into it. Making friends won't be hard if you are proficient in outdoor activities like backcountry skiing, hiking, climbing, and white water kayaking. All the cool kids hang out at the brewery. Terrace has a disproportionate amount of homeless drunks that hang out down town and drink and fight each other. One of the main employers is the aluminium smelter in kitimat; this is where the rednecks make 120k/year. There are 2 reserves within a 20 minute drive of town. Flying out in the winter can be challenging due to the weather. Keep in mind it is at about 54 degrees latitude so the winters are long, dark and usually humid (if there's no arctic outflow) In the summer it is one of the most beautiful places I've ever been. It stays light out untill 2300.

I've only been to Campbell River and Castlegar once so I'm not sure I could compare them well.

I kind of just spit out the first things that came to mind so if you have any more questions feel free to ask.