Hi there -
Add me to the list of people that won't drink alcohol unless it's disguised as something sweeter!
You could try Malibu (coconut rum) mixed with Diet Coke, anything frozen is usually good - strawberry daiquiris & margaritas are probably my favorites, and the company that makes Mike's Hard Lemonade has a Twisted Tea, and a Half & Half, too - they're not as common at bars - but wow - those Half & Half's are pretty good!
Have a great birthday!
Shells
(commercial voice over: "and remember, to always drink responsibly...")