Jeff,
Doral is like many other resorts..."outside" guests can play, but the price may be higher. you may try to a twilight rate to keep things reasonable.
As for Crandon Park Golf Course, it is also another very worthy layout...fun course with tradewinds, marshes, great views, etc. and will not break the bank.
BillV's suggestion for WPB Country Club is another good one...played there last summer. They allow walking in the afternoons, plays fairly quick, and is one of Dick Wilson's older layouts (used to be private, now a local muni).
Others are correct that the Ft. Lauderdale area leaves a lot to be desired, except maybe for some of the private stuff which I have yet to tackle myself.
Good luck and enjoy the warm weather. I'm heading out to Hawaii with the family on January 2nd myself...I won't miss the beginning of the winter season here in Dubuque one bit!