I can't tell from the small maps in the regulation book where exactly the boundaries lie. Where can I get a better map?
Your best resource is probably the Idaho Huntplanner at http://fishandgame.idaho.gov/ifwis/huntplanner
There you can find maps of Unit 4A that are larger for printing or interactive so you can zoom in or out. There are also kml files you can load in google earth or gps units.
These links specifically should help:
Unit overview with links to resources http://fishandgame.idaho.gov/ifwis/huntplanner/area.aspx?ID=176
Interactive Map of Unit 4A http://fishandgame.idaho.gov/ifwis/huntplanner/mapcenter?lyr=0&lbl=Unit+...
PDF Map http://fishandgame.idaho.gov/ifwis/huntplanner/download/pdf/hunt_ID176.pdf
KML File http://fishandgame.idaho.gov/gis/rest/services/Wildlife/HuntPlanner/MapS...
You can find links like this for all the IDFG Hunt Areas at http://fishandgame.idaho.gov/ifwis/huntplanner/mapindex.aspx