Sight
Identify how many colors and shapes you can see in a given setting. Try to guess what something is within 20 feet or farther away. Write down detailed descriptions of the objects as if you were explaining what they are to a blind person. Also take pictures of animals within their natural habitat. What parts blend in and which stand out?
Smell
A great guessing activity involves some preparation. Gather natural smelling objects as fresh grass, flowers, animal excrement, fruit or mud. Have a friend put each into identical cups and let you guess what the object is based off of the smell alone. On your own, determine if the objects smell different at various times of the day.
Hearing
While you will need to rely on sight to first connect what makes certain sounds, write down descriptions for future reference. Take a trip to the zoo or a wildlife facility to become acquainted with the sounds of a variety of animals, listening to volume, length and pitch of the sounds. A friend can also put random small objects, such as rocks, water, sand or leaves, into closed cups for you to shake and guess what it is based on the sound.
Taste
Gather natural, edible food items such as berries, fruit, honey and herbs, collecting at least one for each taste (sweet, salty, sour, bitter). Again, have a friend give you a sample for you to guess what the food is based on taste. For those with experience and proper licensing, catch different types of fish or wild game to cook and learn the different tastes.
Touch
Another fun activity involves touch. Have a friend place sticks, sand, bird feathers, acorns, leaves, dirt, animal fur, tree bark and any other objects with an interesting feel in random boxes. Without peeking, plunge your hand in and guess what the object is. Also try to determine the direction of the wind at various elevations.