Yes. I was there on a Monday.

I agree - call the SB tourist bureau.

We rented a car but from SBA airport the beach area and hotels is pretty close. We drove up in the hills and did some other site seeing. There is a touring trolley to many of the attractions, but not sure of the price. google the SBA trolley

The entire area is dog friendly for well behanved dogs. Bring your own poop bags and doggie water. Service Dogs can walk thru the tour portion of the mission. We are very conscious dog parents, one of us opted out during the first portion of the tour while the guide was talking and then had the pooch join when we started to move thru the touring portion of the guided experience.

not far from the harbour, totally doable

It was first built in 1786 but rebuilt after earthqaukes around 1812. It was rebuilt again after an earthquake in 1920.

I have askes in the Mission web, and Laura Foss from the Mission Tours had answered very kindness to me: The vast majority of our site is wheelchair accessible. You can access the Church by going to the end of the front portico where it is level with the ground (near front steps) then go down to the Office which is just past the Gift Shop. Then you will be shown how to enter the Church from the side door which has a wheelchair ramp leading up to it. All of the Self-Guided Tour is accessible with exception to our Cemetery. Our Women's Public Restroom does have a wheelchair accessible stall but our Men's does not. Men who use wheelchairs should go to the Porter's office to inquire about one of our Staff restrooms which does have a grab bar.

WE have a certified ESA dog, with all his letters. He was permitted to take the tour. It is 45 minutes with lots of stops. We bought water for him, since it was hot while we were there.