Try this place for a great breakfast sandwich. Last time I was there they had peameal bacon. http://mikeandpattys.com/ NOTE: Place is tiny.
I thought the Duck Boat tour was a blast.
If near Copley Square on Saturday they have a nice farmers market.
Second the Newbury Street suggestion.
OK - so now you know what is going on. Finish the day like you would any other day. Go home kiss your wife / hug your kid / crack a beer, exhale and put this day behind you.
Monday when you go to work you are all in.
My suggestion was sarcastic in nature. It seems like once a month someone is asking for advice on some critical personal nature (health, investing, legal, etc) instead of going to an expert.
The stronger flavor is in the seed head. Dill is easy to grow. However, if the seeds fall off the head of the plant you'll have volunteer plants all over the place. They are easy to remove with a little hand cultivation.