What are some mild, sweet tasting teas?

My friends can't believe that I don't drink coffee and I'm constantly getting asked out to Tim Hortons and the like. The truth is, I've never really been a fan of bitter hot drinks but I guess I might as well start now. I heard that tea is better for your health than coffee and the taste seems like it would be easier to get along with. What are some mild and sweet tasting teas that I could start with?