Thank you, Texastravelmom, for your input. I considered it in my slightly modified schedule.
To note, I really do want to do two thermal baths as I have arthritis, and I think they might help, at least keep me more relaxed and maybe a bit looser.
I did remove the Great Market Hall; if time allows and I am in the area, I might check it out. I also decided to not see the Great Synagogue because it is very expensive and sounds like it will take too much time and I think I would rather see the House of Terror (tough choice).
I have trouble helping without knowing where a person is staying.
It’s a big city but very manageable if you design a day with no
backtracking or little or no overlap of the day before. But again,
that depends on where you are staying.
Odds are at some point if you plan your travel well, you will be going
past the Great Market Hall. That can be a 5 minute stop or an hour
long stop. But do stop. The Great Synagogue is worth the short tour
(30 minutes) and I don’t remember it costing much but …. The House of
Terror is very much worth the time and it will take at least an hour,
maybe more if you are interested.
Saturday: I will walk by Parliament (not in), see the Shoes, and then Margit Island (maybe) or explore the Jewish Quarter. I will be tired, so there will not be much on this day. What time do you arrive in Budapest?
Jewish quarter and the Parliament are not exactly close. So map out
how you are doing this. Where you stay will have an impact on things.
It is Saturday so some of the Jewish aspects of the Jewish quarter
will be closed. But there is a lot more there than that.
Sunday: Margit Island, early (if not the day before) House of Terror at 10:00, St. Stephen's Basilica, at 13:00 or later, then Lukas Thermal Baths, explore, Night River Cruise
Again, depends on where you are staying as the House of Terror is in
one part of town, St. Stephens in another and Lukas in yet another.
But you can tie them all together depending on where you are coming
from and where you want to end up.
Monday: Buda Hill (Bastion, Church, Castle, etc.), Hospital in the rock, the Cave Church.
Tuesday: Széchenyi Thermal Bath 7:00, then Vajdahunyad Castle, the Museum of Fine Arts, and finally Heroes Square. (This might fill the day?)
That might indeed fill the day. That and walking the length of
Andrassy ut.