First off, here is a map of the entire course:
Next, a link to road closure information. Very important.
The list of CIM-recommended spectator locations is on this page. On the list, Oak Avenue and Fair Oaks, Old Town Fair Oaks, Fair Oaks and Manzanita, Loehmann's Plaza, and the finish at the Capitol. Plus, of course, anywhere on J Street before Alhambra, or L Street from Alhambra to the Capitol.
Of course, the CIM provides live runner tracking again this year. It is available here. My bib number is 1022.