Leave Penzance/Hayle for Porthcurno (~25-30 min) - the Minack slot is fixed, so it drives the day
Minack Theatre & Garden visit, self-guided, 10:00-11:30 slot only
Drive back towards Marazion via Penzance, lunch on the way
Causeway opens - low water 15:31, walkable roughly 13:30-17:30, castle last entry 15:45
Free evening once you're off the Mount - dinner in Newlyn or Mousehole
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Worst weather of the week - forecast has moved to 90% rain. The Minack visit is self-guided rather than the evening performance, so it's a short outdoor look-round rather than three hours in a fixed seat.
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Tide window doesn't repeat. 13:30-17:30 is the best causeway window of the week, rain or not.
Timings
Time
Activity
08:45
Leave for Porthcurno (~25-30 min)
10:00-11:30
Minack Theatre & Garden visit
11:45
Drive back via Penzance, lunch
13:30-17:30
St Michael's Mount - causeway walkable, castle last entry 15:45