Thank you @bkkmfj2648 for the excellent posts. I paid a brief visit to Da Nang last November & really liked it.
Odds & ends:
Nha Viet Banh Mi & Coffee on Ha Chuong, the side street near the Monarque Hotel, is a popular banh mi place which I liked.
For a culture fix, the Museum of Cham Sculpture, across the river near the end of the Dragon Bridge:
https://vinpearl.com/en/museum-of-cham-sculpture-2025-tips-for-visiting-and-more
I tried the T Ten Massage Studio, one of the few male-male massage shops in Da Nang. It was a small shop on a residential street. There was only one very average looking masseur available, the massage he did was decent but no more than that.