The World’s End is absolutely gorgeous if you want a nice walking area. The seafood restaurants around there are also great, especially Stars on Hingham Harbor. Great food and atmosphere.

Avoid Dorchester, Jamaica Plain, Lowell and Brockton. You should definitely go to Park Street on the Green Line where Downtown Crossing is and you will see the heart of Boston. Nice to walk around too and they have amazing restaurants and coffee shops. Avoid this area at all costs after about 7:00pm. The whole vibe changes. Most stores are open until 8pm due to the high crime and homelessness in that area and the cops show up.

Check out Harvard Square. Classic.

If I think of more I will update.