We mostly ate at the hospital cafeteria. If I remember correctly you have the most choice at lunch: short order grill; pre-packaged sandwiches or sandwich bar; or entree choices with side orders. However, lunch is the busiest time of the day. Dinner might be more limited to one or two entree choices and then sides. I don't remember paying more than $9-12 for both of us (dinner). But in reality, I wasn't eating that much, and neither was my Dad.
After awhile, my father and I would walk down towards Macarthur Park. There was a Thai/Chinese restaurant that we ate at twice, and a couple of local diner/fast food type places. Right across St Vincents is a Burger King, and after awhile during our neighborhood walks we would stop in for a shake.
During that post-op time, I had the most energy during the mid-morning so we would go for a walk and then stop for lunch and then go back to the hospital for my nap. I would have to stop and rest walking back to the hospital cuz it's a slow long hill.
The neighborhood down by Macarthur Park is latino with lots of people hanging out on the sidewalks, it didn't bother me, but some people on the forum comment about it. If you walk in the other direction the area is mostly low rise residential and seemed deserted during the day. On one the cross streets was a supermarket that we walked to one day (seemed like it was far away but probably it was only a hundred yards or so).