Hot and sweet starbucks drink?

Hello! I am flying to Boston from Texas tomorrow with my school at 3 in the morning tomorrow. Normally I don't like coffee (or starbucks)but I definitely will be needing some espresso and we are making a coffee stop :D I have little to no tolerance for bitter drinks. What is good on the menu for someone with a sweet tooth? I think the carmel macchiato sounds good... :) Thanks! *to Boston I go!*