* Kayak with dolphins

* Hike in a rain forest, swim in a bioluminescent bay

* Collect waterfalls

* Follow the mission trail

* Pitch a tent by the sea

These are some of 100s of activities you could do this summer - listed in The 100 Best Affordable Vacations by Jane Woolridge and Larry Bleiberg (published by National Geographic Society, 2011.)  Unique among travel books, 100 Best is arranged by activities rather than locations, with a focus on North America.  Under each activity, ideal places, geographical and historical details are listed.  While most activities have their own localities, some are marked as nationwide with place recommendations, such as Celebrate American Folk Arts, Check Out "Unknown" Parks, Ride Historic Rails, etc.  Each entry ends with "How To Get In Touch" section for more information gathering by address, phone, or email/Web.  100 Best is one of the few travel books that you could read without being overwhelmed by maps and other information.  With 100 Best you will discover a world of adventures this summer without emptying your bank account.