Adobe Illustrator Line Clean Up

I'm working on cleaning up lines on a line drawing of a city in Adobe Illustrator. I need to clean up the sidewalks and increase the line weights around buildings. It is tedious work but easy, and I can send you specific directions. This project will probably take 2-3 hours. If it goes well and if you like this type of project, I will have more just like this over the next few months.