Could someone please advise us as to the best travel pass to get for Boston. We're in the city for 3-4 days and then again for 4-5 days. There are 4 of us, 2 adults and 2 children, aged 12 and 15. Is the 7-day LinkPass the best bet (bought twice, I guess)? What about children? The Students' pass seems to require an ID provided by US high schools, and we're from the UK.