Apoala and La Tratto were the first restaurants in the Santa Lucia arcade of the park when it was renovate a few summers ago. Since then most of the shops have moved out except the exceptional chocolate shop Ki´Xocolatl. Now there are another half dozen restaurants in the square all with competing music but not one of them can compete with Apoala for consistently good food and service. All of the ceviches and salads are good and fresh. I love the soft shell crab tacos and the squash blossoms in tomato sauce. If you were here for a week you would not get bored having lunch and dinner at Apoala. The only thing that might bore you is the competing cacophony of music coming from all of the restaurants in the arcades. That and the people selling souvenirs and dead roses.
I recommend having the mescal taster so you can see which mescal you like best. It will serve you well over the time you have in Mexico. After dinner you can have cocktails at the Malahat Speakeasy.