Old Town San Diego State Historic Park
Begin here because the park does the most work with the least friction: the central plaza, adobe rooms, transportation and newspaper exhibits, living-history demonstrations, and staff who can tell you what is actually open. Admission is free. The official daily window applies to the visitor center and select museums, not a promise that every door and demonstration runs every day. Get the current map first, then build a loop around the open interiors instead of treating the retail courtyards as the main event.

