| USA | |
| Hawaii: volcanos | Five Day-Hikes, Mostly on Volcanoes |
| Washington: Cascades | Introduction to Fossils & Crystals |
| CANADA | |
| British Columbia | Geology & Fossils |
| CENTRAL AMERICA | |
| Nicaragua: volcanos | A Classic Ecotour |
| EUROPE | |
| England | Geology Tours in Devon |
| Iceland | Seven Days All Around Iceland |
| Romania | Two Weeks in the Southern Carpathians |
| Scotland | Seven Days of Wilderness Walking |
| ASIA | |
| Malaysia: caves | Trekking to Mulu |
| Thailand: caves | 7 Community-based Tours in Ethnic Minority Villages |
| OCEANIA | |
| New Zealand: mining | Nature Tours & Lodging 110 Kms from Christchurch |