Copy that.
Where you are it's worth mentioning Top of the Hub, rooftop restaurant at the Prudential Center. Don't eat there, but worth the elevator ride for a drink and a view. Touristy, great views.
If you were to do any guided bus tour thing, the Boston Duck Tour is only option. They're an hour and half long, and honestly, if you walking all day, kind of a nice leisurely break. Book later in the day, drops you right off near hotel (Prudential pick-up/drop off location), and can refresh before dinner.
Right in hotel area, for lunch/daytime/people watching:
Abe&Louie's: steakhouse, which I never recommend to New Yorkers, but great patio for lunch, and a buzzy bar, if you two want to meet some wicked cool locals, kid.
Stephanie's and/or Sonsie: Have been popular local spots forever, this is streetside drinks, Newbury St people watching. Snack at both places, rather than meal.
Citrus and Salt: cool little Mexican place for lunch. Killer lobster roll actually.
La Voile: Newbury Street French bistro.
All the above are staggering distance from your hotel.
Dinner:
Two French spots worth debating for dinner: Ma Maison and Menton. Check them both out. Menton owned by Barbara Lynch, my favorite Boston chef (she's a Southie original actually). Love both places.
If it was me, I would do a night in the North End
on Hanover St. Get drinks and some apps at Bricco or Lucca, it's a great street to hit a couple spots on same block. If Cafe Vittoria not crowded, grab an exceptional cappuccino.
The Seaport area has blown up, and there are great restaurants down there, Row 34 for seafood for example. But the area is all so new and shiny, it doesn't really have the same feel or charm of Boston. If you lived in Boston, it's part of your routine, but to visit Boston, I don't know that it's necessary. It's nice, of course, but a little more spread out, and with only a few days, no tragedy if you miss it.
If you do the Quincy Market thing, I would make a reso at Union Oyster House, and soak up the oldest restaurant in the country. The waitresses are named Patty/Connie etc. and are sweet as heck.
PTown trip is a really good idea