Nature Journaling: Some ideas and links to get you started.
(Excerpted in part from Keeping a Nature Journal, by Clare Walker Leslie and Charles E. Roth)

What is nature journaling?
Nature journaling is the regular recording of observations, perceptions, and feelings about the natural world around you. The recording can be done in a variety of ways, depending on your interests and purpose. Some people prefer written prose or poetry, some through drawing, painting or tape recording. There are people who record data with mathematical precision, using scientific shorthand. Many people use a combination of all these techniques.

Why keep a nature journal?
Many people keep journals to explore their own creativity and express observations and experiences of the world more fully. Some keep journals to record information and data about a place they may visit many times. They keep journals to help improve and sharpen writing skills, and in the process learn to observe better. Drawing is used as a prime record-making tool because drawing and observing are mutually reinforcing activities. With practice, it can be faster to draw a squirrel jumping from one branch to another than to write out a full description of the squirrel's actions! Working in our journals gives us a chance to slow down, reflect and focus on a place - and in the process we establish a greater connection to the natural world. The information we collect in our journals can be used for research projects and shared with scientists and land managers that work in the areas we visit. Nature journaling helps you develop a real sense of a place and your role in that place. In our busy world, we often move quickly from place to place, without much thought or knowledge about the actual landscape we live in. Nature journaling gives us the chance to slow down and observe the world around us.                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

Tools to get started:
Journal    Most folks prefer the hardbound blank books that come in various sizes. Zip lock bags make handy journal protectors and can hold your drawing supplies as well.
Pencils and Pens    HB (hard, firm lines for plants), 2B (softer graphite for plants and birds), 3B (still softer for birds and animals) The really soft drawing pencils smudge real easy. Regular pencils are usually 2B. Colored pencil sets are convenient for adding color to a sketch. Pens make wonderful line and contour drawings and some people prefer them for writing. 
Pencil sharpener
Technical drawing pencils    These are always ready when you need them, never needing sharpening.

Entering Observations: Basic Information for each entry
In either the upper right- or the upper left-hand corner of your page record the following, using both written word and illustration, as appropriate and desired:

1. Date/Time. Date establishes the season and month in relation to the year. Time. Sometimes this can just be "mid-morning" or "late afternoon", other times you will want to use an exact time (if you are timing a slug's movement, for example).
2. Location. Where are you? Town and State? Park, campground, trailhead? If you know your Latitude and Longitude (coordinates), record them.
3. Weather. Weather conditions affect the activity of most living things. Record such things as  wind speed and direction, barometric pressure, cloud patterns and cloud cover. For more on clouds click here. They can be drawn in a little box, or described.
4. Temperature.  Scientists record temperature in Celsius. To convert from Fahrenheit to Celsius: 5/9 F - 32 = C.
5. Plant and Animal List. Common or Latin names. 
6. Habitat, the general environment you are in, such as wetland, forest, river, etc.

Once you record this basic information, spend some time observing the ground, things at eye-level, overhead observation, and soak up the whole landscape you are in. You will naturally focus on the things that you find most interesting, but as you expand your awareness, you will begin to see things you have never noticed before.  Using all of your senses to make observations, use your writing and sketching skills to bring those observations to life in your journal.

Some Sample Journal Pages:

Above: From Keeping A Nature Journal, by Clare Walker Leslie and Charles E. Roth

Above: From the personal journal of Heidi Engle

Above: From the journal of Carolyn Duckworth, in Keeping a Nature Journal, by Clare Walker Leslie

 

A great article about nature journaling, to inspire you!
http://www.conservation.state.mo.us/conmag/1997/07/3.html

An excellent nature journaling bibliography, lots of great books here:
http://www.calacademy.org/research/library/biodiv/biblio/natjour.htm