Hey Guys

I'm driving down from Ottawa to Providence for the Joe Con and we're gonna spend some time before the con touring some of the cities in the states on the way down.

I'm not sure how much time to spend in each of the towns/cities before heading down to Providence. We're planning to leave on the Friday Night. So we'll be in

1. North Conway for the outlets,
2. Portland
3. Salem
4. Boston

What's good to do in these places and how long would I need to spend in each of these cites?