“Spend less, see more” -- this has been the candid and standard advice dispensed for 25 years by Seth Kugel, author of “The Frugal Traveler” in the New York Times . Now, in book form -- under the title, Rediscovering Travel: A Guide for the Globally Curious -- Kugel codifies his practical approach to travel, updates it to deal with the modern, digitally dependent travel industry, and gets philosophical about the experience of travel.