"What I don’t like is the open end in the sewers, where players don’t get a clear signal that nothings to be had down there and the DM has do come up with content till they give up."
Any ideas how you would approach that? I was struggling to fit in what I did, but I'll admit that I often focus more on presenting a storyline than stressing over things I feel can be left to GM interpretation. I'd love any suggestions you can make.