Budget

Airfare: 
~$400/person (Seattle to Boston) = $3200

Lodging: 
~$625/person for 6 nights = $5000

Rental car: 
~$125/person = $1000

Gas: 
40 miles r/t Boston-Salem + Cape Cod
~ $62.50/person = $500

Food: 
~$75/person = $600

Souvenirs + Tips: 
~$212.50/person = $1700