From Mammoth Cave to Carlsbad Caverns, the couple adjusts to close-quarter living as they stumble through adventures: fun, frustrating and at times downright scary. Along the way Florence muses on the foibles of life: Praise for Marriage Tip 102: If you travel in a 23-foot space for months at a time, travel with someone you've loved for a time. The adventures will be doubly fun and the disasters only half as bad. - Elizabeth Kerekes, co-author,