If you think this warrants it feel free to re-add it. I've mostly seen (and used) boundary=protected on state parks and similar areas under some kind of statutory protection.

That's a fair point. I've changed it to a pedestrian area and mapped the entrances.

Part of the structure rises above the ground and is visible from the street.

https://www.google.com/maps/@40.1070059,-88.2224079,3a,75y,359.87h,87.62t/data=!3m6!1e1!3m4!1sPMAmOKnyosL19RS0RZjquQ!2e0!7i16384!8i8192?entry=ttu

Why is that the case? They might not be mapped as buildings but I would think they could be mappable as nodes or areas.

This one is actually only partially underground so I think it should still be mapped as a building.

Usually they are mapped as landuse=grass and/or landcover=grass, so what you mapped is fine.

Are both bodies of water really called Sears Lake?

The regional planning commission maps it as a shared-use path so that document is likely incorrect. I haven't seen any other source that restricts it to pedestrian use. https://ccrpc.org/wp-content/uploads/2015/02/greenways-2014-plan-plan-only.pdf

I'm not certain The Boneyard Greenway is actually a cycleway. This pdf https://humanresources.illinois.edu/assets/docs/iWalk-Toolkit/boneyard.pdf claims it is intended only for pedestrian traffic. I mapped it as a path with bicycle=yes for that reason.

Thanks for contributing!

You can do this by drawing a line tracing the interior, holding shift while selecting the interior line and the exterior line, and then right clicking and selecting the "+" icon to merge the two lines into a relation.

At least as far as I can tell from the satellite imagery.

They plan to extend Hershey eventually, but I know what you mean.

Would these waterways be better tagged as streams?

Welcome to OpenStreetMap! I think historical performances at venues may be outside of the scope of OSM though.

Does the US have Living Streets? The wiki seems to limit the designation to streets whereon cars legally must yield to pedestrians. highway=living_street#United_States

If you look at the Mapbox imagery, it appears the road no longer crosses the railroad tracks at Maple Hill Road. At best there is an unofficial footpath. IDOT has been reducing the number of crossings.

Ah, okay.

I think Clark Street has bike lanes for at least a portion of it.

Thanks! Incidentally, you can mark tag private roads as a "Service road" or "driveway".

Thanks for Relationising this. Why did you change this route from Primary to Secondary? I believe this is still the preferred non-Interstate connection between Bloomington-Normal and Chicago.