Whenever I'm Christmas shopping, I end up stopping in at Black Ink. They fit a ton of stuff into their relatively small stuff and it's always interesting and fun to look through. You can find tiny board games, kitchen gadgets, and all sorts of unique stuff here. It can be a little difficult looking around, as the store really utilizes its wall space by stocking items all the way up to the ceiling but even if you go for the things just on the bottom shelves, it's worth a look.
The Watch Hospital is located in downtown Boston and convenient to pop into on your lunch break. If you need a battery changed or some kind of repair done, I would recommend it. However, if you're looking to buy a new watch, I would go elsewhere, as the selection here is small and very expensive.
My sister works near this salon and gets her nails done here on her lunch break. It's $10 for a manicure, and she can just barely squeeze it in on her lunch break. The only drawback here is that on more than one occasion, she's asked for a French manicure and received only a regular one. Otherwise, a very serviceable nail salon.
Cardullo's is a specialty food store roundly ignored by most Harvard students because the prices are prohibitive to college kids. However, if you have a little cash, it's a nice place. It has specialty and higher-end foods from around the world. I've had coffee and cheese from there and both were very good, if wasted on my dining-hall desensitized palette. Good for grown-ups.
My sister's one request for her last birthday was a strawberry shortcake from Eldo's. I'd never been here before and everyone was pretty skeptical about trying a new bakery but it was the best strawberry shortcake any of us had ever had. From what I've since tasted at Eldo's, the shortcake was pretty representative of the rest of their food: light and delicious. You won't get a sick, heavy feeling from eating their desserts. Very tasty.
Angelique's is where lots of the girls from my high school got their prom dress. They had a large selection and an accessory and shoe section in the store as well, so it's basically your one stop prom shop. If you do shop there for a school dance, Angelique's has a book where they record what school you're from and what dress you bought, so you can avoid showing up to the dance wearing (horrors!) the same dress as someone else. Seriously, though, this is a nice feature and a nice store for all your prom and homecoming needs.
Surf Cleaners is the dry cleaner's I used while I lived Winthrop. The prices are about the same as everywhere else and so is the service. There is a small parking lot right outside the store but parking is never a problem in this area anyway. They have a tailoring service in addition to dry cleaning. Whenever I had an item that I needed cleaned by a certain date, they were pretty good about getting it to me about then. Be aware that their Saturday hours are a little shorter than could be desired.
Globe Corner Bookstore, not to be confused with the Boston Globe Bookstore (which I think is now closed anyway), is a store specializing in travel materials. Their map collection is really cool. You can get pretty much any sort of map imaginable here, including historical maps, specialty maps (like hiking maps), road maps, and your regular wall maps. They also sometimes have lectures at the Church across from the Harvard Square T stop. I don't like to travel, so the Globe Corner Bookstore fulfills my globe-trotting needs.
To be fair, I have never been to another aquarium to compare, and I might just not like sea creatures that much. However, I've never enjoyed a day at the New England Aquarium. The building is small and, the times I've been, so crowded that you can't even get close to the exhibits to see them. If you go, definitely try to pick an off-peak time. There is a food court - mobbed - and a Legal Seafoods nearby if you get hungry (although I don't know what sort of message it sends to spend a day admiring sealife and then a night eating them). The aquarium has an IMAX theater nearby that my little cousins enjoyed much more than the aquarium itself. If you're really into marine life, you'll probably enjoy a trip here. Otherwise, I'd stay away.
New Deal is a fantastic food store. My grandparents love it so much that they make weekly pilgrimages there so I would be hard-pressed to say anything bad about it. Luckily, there's nothing bad to say! New Deal has a huge fresh fruit selection. It also has a nice deli, delicious sandwiches and a big Italian foods selection. Maybe the best part of all is that their prices are extremely good. If you want to get extra value, watch out for the weekly specials. And if you see my grandparents, say hi.