Travel/outdoors30. Drinking Water -- 99 cents
Ditch bottled water while visiting Rome with Drinking Water, which maps out the position of more than 200 drinkable fountains.
31. Geocaching Toolkit -- Free
Geocaching, the green outdoors game of hiding and seeking treasures, has caught on throughout the world. Geocaching Toolkit guides players between locations with clues involving puzzles, calculations and projecting a new waypoint using distances and bearings. Sometimes the calculations are easy, but this toolkit can help when calculations become tedious.
32. iLocate -- 99 cents
iLocate is a comprehensive searchable database of national and local parks, beaches, theme parks and amusement parks throughout the U.S. You'll find contact directions and details on each park.
33. Lonely Planet Travel Guides -- Prices begin at 99 cents
Lonely Planet Travel Guides are the guide of choice for many frugal and green travelers. Various apps provide paperless guides for both U.S. and international destinations. Some of the guides are buggy and need work, but Lonely Planet is working on updated versions. Tip: Read the reviews before buying.
34. Peterson Field Guide to Backyard Birds -- $2.99
The final word in bird guides comes to iPhone in a bigger and better format. The Peterson Field Guide to Backyard Birds allows you to view bird images, listen to recorded bird songs and calls, run a filtered search by species for your geographic area, and more. All information is taken from the latest edition of the best-selling Peterson Field Guide to Birds of North America.


