Balboa Park is the best thing to do in San Diego, and nobody takes a ticket at
the edge of it. You walk in off the street and the gardens, the architecture and
a dozen museum doors are simply there, free, before you have decided anything at
all. Half a day goes that way without you noticing.
The rest is scattered across a county people badly underestimate on a map. Half
of what follows costs nothing to enter. Two of them are a full day and a real
ticket each. Stringing four together in one afternoon is how a good trip turns
into an argument about where to leave the car.
So take one anchor and one neighborhood a day, put the water somewhere in the
middle, and let the rest go. You are not going to finish this. Nobody who lives
here has.
Pick a base with where to stay in San Diego by
vibe, and if the days have to run on
transit, San Diego without a car sorts
out which of these are reachable. Swimming decisions belong to the beach
ranking and the county's same-day water
advisories.