A good question.
A local answer.

Check the current journey planner to the garden entrance, including the final bus or uphill walk.

Try a few nearby cafés on different days, checking morning hours and walk time from the apartment.

Leave daylight for the penguin evening and check route conditions, accommodation check-in and park access.

Price the overnight parking against the value of an early start and the rental's pickup hours.

Compare the actual terminal walk or shuttle schedule with the flight's check-in time.

Allow fitting time at pickup and ask about cancellation if the correct seats are missing.

Use the solo day for the activity you most want and the shared day for a route both enjoy.

Choose a boat if the group wants to stay together with less effort, and verify operator limits and weather policy.

Look for bar seating or small tables and a menu that works for one person.

Check each stadium's seating map and weather exposure before selecting a section.

Decide whether outlet bargains or current-season choice is the aim, then check which shops actually trade there now.

Treat them as separate day trips if possible; the driving leaves little time at either place.