1. Have a loose plan. Have a plan for the date gentlemen and hold loosely to it in case of rain, she could express a strong dislike for what you have planned —e.g. "I'm allergic to the smell of coffee," so you compromise for the teahouse instead — or something unexpected happens.
2. Be nice to your servers. Smile at your barista, server, ticket collector or whoever you come across on your date. Starbucks employees need love too and you are giving your date a sense of how you might treat them once the honeymoon phase has worn off.