Cindy
I'm not quite the font of all knowledge, but.....
You'll arrive in Boston on day 2, have your city tour late morning/early afternoon. Subject to traffic and local conditions you would be at the hotel about 3pm where you'll have the rest of the afternoon at leisure. The Welcome drink starts at about 7:30pm.
Now, day 3 is the Cape Cod optional excursion - this is a full day trip for those who are taking it OR a day at leisure for those who would prefer to explore Boston further.
Sounds like all your plans are coming together nicely for this trip! Not long to go now 🙂
Kindest regards,
Julia