There are few things that evoke the feeling of summer more than sipping sundowners at sea. With Pelican Grand Beach Resort’s all-inclusive Mega Yachts & Martinis escape (from $13,000 for two guests), you can stretch that feeling for three nights this winter. Available through January 31, the package comprises one night aboard a 118-foot private chartered Portofino yacht, which sleeps up to 10 people in five cabins, and two nights in an oceanfront suite at the resort in Fort Lauderdale. The Pelican Gra…