What makes this worth the detour is the sheer oddity of the thing. A functioning bar in a VW inside a national park inside a city is a sentence that doesn't really exist anywhere else. The surrounding area has picnic-friendly lawn space, so if you're with a group, bring something to sit on and treat the bar as the supply run. Food options on-site are limited — eat before you come or pair it with a stop at the Commissary or Arguello nearby.

Practical note: parking inside the Presidio is free but fills fast on weekends near the Main Post. Come in via Lombard Gate and aim for the lot near the Officers' Club rather than circling.

With two hours, I'd walk the Main Post loop first, stop at the VW bar for one drink, then cut down toward Crissy Field before the afternoon fog moves in.