Title: will the viewers know what a cadastral map is? Maybe “Proposed Milltown State Park”?
River names should be in italics and follow the river curve. Might be easier to do this in Illustrator.
Make the US (not USA) Forest Service land a light grayed green so that the proposed state park can be in a deep green and stand out most.
“Commercial area” seems to include a golf course at upper left. For our purposes, it’s not terribly important to distinguish residential from commercial. You might use a tan/ocher for residential and a very grayed salmon for commercial—but make the golf course some kind of green.
Maybe give the white areas a light tan or gray fill, and then you can make all the parcel boundaries very thin white so they recede to the background.
Is the projection info important to the viewers? The scale bar is overly prominent and detailed. Why does the legend overlap the map? Why does it have a round-cornered rectangle battling for control of the box? What order are the legend items in? What does State of Montana mean? Presumably that’s also some sort of conservation and open space area that should be green.