The Charleston Marine Life Center sits on the working waterfront at the mouth of Coos Bay, close to the fishing docks and the road out toward Cape Arago. It is run by the Oregon Institute of Marine Biology, so the displays feel more like a field station than a polished aquarium: tide-pool tanks, crab and fish exhibits, seabird material, and the kind of coastal specimens that make more sense here than behind glass in a big city.
It is a compact stop, but a good one if you are using Coos Bay as a base for the southern Oregon coast. Pair it with Sunset Bay, Shore Acres, or the Cape Arago viewpoints, and leave time to look around the harbor itself. Families will get the most out of the touch-tank scale of the place; curious adults will appreciate how directly it connects to the research happening next door.