I have a visitor pass. Does this just get me in the door for a self guided walking tour?

I believe it gets you into the garden and you can do a self guided tour of the garden. The tram and swamp as well as boat or house tour would be extra. But you would enjoy the beautiful walk and you could enjoy the gift shop and Cafe for lunch.

Yes. On a beautiful day and if you have time, it will be more than sufficient

Yes

Yes, just for the self guided tour.