Prince Rupert has a very active, friendly running club. There are several races and a 13 week running program that generally starts in February. This year was messed up of course and who knows what next year will bring, but there were several virtual type activities that were organized through the facebook page where you can introduce yourself. There are a number of people who run regularly throughout the year.
The Rushbrook trail is the closest you will get to the seawall. The trail itself is about 2km from downtown but if you start downtown (at Kwinitsa Station at the bottom of Bill Murray Way below Rupert Square Mall) you have a 2km run along the water front to reach it. Not only do you have the waterfront as your view, it is the the only stretch of flat ground in Rupert. The trail itself is about 1.5km, so there and back is 7km.
To get to Butze from downtown is a 5km run along the highway, but if you have a vehicle there is plenty of parking at Butze. The trail is a 5km loop. Both Rushbrook and Butze are used by anybody from the serious runner to the casual walker.
Across the highway from Butze is Tall Tree Trail which is more of a hike than a jog as it takes you up the mountain. When it rains (and it rains a lot here) it is pretty sloppy, but on a sunny day it is well worth the view.
Welcome to Rupert.