Lakey Peterson’s return to the Land Down Under has brought her back to the top of the surfing world. Santa Barbara’s most accomplished female wave shredder was only 5 when she stood up on her first board while on a family vacation in Australia. Peterson, now 31, returned to the Southern Hemisphere to accelerate her comeback in the sport by winning the World Surf League’s Margaret River Pro last week. “It’s cool to prove to myself that I can stil…