Blurring the lines between fun and fitness.

As the saying goes, all work and no play makes Jack a dull boy. To help you avoid that predicament, we’ve combed the globe for 20 of the world’s best ­adventures, from mild to wild. Your one task: Get out there and find your fun.

Relax with a Little California Dreamin’

You might describe Terranea Resort as the ultimate infirmary for the weary and the stressed. Work out the kinks — while whale watching, no less — from a chaise overlooking the Pacific on the Palos Verdes Peninsula, just 20 miles south of LAX. Snag a luxe 1,100-square-foot Spa Bungalow Suite and stroll back and forth between what feels like your own personal spa and the Spa Café. A fitness center also overlooks the ocean, and miles of scenic blufftop trails allow for fine, rumination-filled hikes.

Forge Unforgettable Family Memories on an Unforgettable River in Idaho

Western River Expeditions is known for its family adventures, and Idaho’s Salmon River is known as one of America’s loveliest wilderness rivers. But for young ones, 74 miles of unspoiled river may not be entertainment enough. This year, WRE raises the fun quotient on their five-day/four-night “Salmon River Canyons Family Magic” rafting trip by toting along a River Jester who, among other feats, brings nature alive with games, activities, and campfire stories. The organization also oversees dinners prepared specifically for the kids. Nothing but s’mores, anyone?

Hike Hong Kong

Not your first thought when it comes to the outdoors, but Hong Kong and its surrounding countryside (yes, countryside) is laced with trails. On Hong Kong Island, enjoy the Peak Circle Walk, with stunning views of the iconic city and Victoria Harbour, or Dragon’s Back, featuring sweeping South China Sea vistas. But Hong Kong’s most magnificent hike is the MacLehose Trail, with breathtaking views (and climbs). The entire trail, which crosses much of the New Territories, is 62 miles long, but it’s well marked and conveniently divided into manageable sections.

Kayak Off the Grid in the Bahamas’ Out Islands

Everyone goes to Nassau, but the Bahamian Out Islands operate at the pace of the tides, and you will too on ­Explorers’ Corner’s new kayaking trip through the Exumas. The Exumas comprise some 365 cays — more than enough to get lost in. But numbers don’t really matter. Paddle through a world of empty islands with white-sand beaches (where you’ll camp for six nights), empty reefs (where you’ll snorkel), and empty waters (where the deeps are blue and the shallows the lightest green), and you’ll just drift on an oceanic quilt beyond words.

Learn Golf’s Fine Points and Unwind in Fine Style in Arizona

Bird Golf Academy claims the world’s finest staff of teaching pros, with PGA pros, U.S. Open and LPGA Championship winners, and Hall of Famers. But what really matters is their student-to-teacher ratio: one or two students per instructor for six to eight hours a day. Bird Golf has academies around the country, but those who like the good life off the greens should note that the Chandler, Arizona, academy is on the grounds of the Sheraton Wild Horse Pass Resort & Spa, one of the country’s top resorts and home to two 7,000-plus-yard courses.

Enjoy a World-Class New Zealand Hike
The Tongariro Crossing, on New Zealand’s North Island, is known as one of the best one-day hikes in the world. A rugged 12 miles, it traverses lunar landscapes, thermal vents, ancient forests, and the green-on-green Emerald Lakes, the lot of it in Tongariro National Park, a World Heritage Site. Tongariro Expeditions will provide hiking info, as well as drop you off and pick you up (it’s a one-way hike). The historic Bayview Chateau Tongariro will provide happy respite at day’s end.,

Take a Really Long North American Bike Ride

Welcome to the inaugural North ­American Epic, the rare transcontinental bike ride that pedals through both the United States and Canada. In other words, the catnip for saddle sorts. On May 29, 2011, start at San Francisco’s Golden Gate Bridge and finish at the Atlantic’s edge in St. John’s, Newfoundland: 76 cycling days averaging 65 miles a day and including nine American states, five Canadian provinces, climbing the Rockies, listening to the blues in Chicago, and eating lobster in the Maritimes. Tour d’Afrique oversees the fun. ­