Welcome to the board.
I've been living in Salem since February and the fishing here is not that great, especially without a boat. There are some ponds and sloughs in Minto Brown park, but not much bank access. The areas where there is access are heavily fished. If your dad's boat can get you into the area by the acid ball, you can access the biggest slough in Minto through there.
Walling pond (as you've already seen) is just south of downtown. It's an odd little pond in the middle of an industrial park that used to be a gravel pit. It's a good place to get to quickly after work, and you can hook some decent fish in there. It's just more like a fishing hole than a nice natural setting. the dumpster diving story sounds about right LOL...
I've been experimenting with bank fishing the Willie from the Marine Park boat ramp. Primarily, I'm practicing with casting, presenting and mending line for the weekends. I've been taking the hour drive out to the coast on Saturdays to drift and bobber/egg fish for Salmon and Steelies. If I actually catch something while practicing in the Willie, I'll let you know. I'm not exactly holding my breath though
Again, with a boat, you can hunt for sloughs and such off of the main river. There are supposedly large and smallmouth bass to be found there.
That's all I've come up with so far, but I haven't lived here that long. If you find a good spot, or want to get together for an after work trip, let me know...
Scott