There are many types of meditation practices and activities you can do on your own. There are also activities you can do as part of a group.
A meditation exercise can be as simple as doing some deep breathing, or as complex as repeating a mantra or doing Transcendental meditation. Any activity that helps to quiet the mind could be considered a meditative activity, even sitting outside and quietly watching the world go by.
There are many types of meditations, including but not limited to:
Deep breathing exercises
Guided Imagery and Visualization
Focused Attention Meditation
Progressive Relaxation Meditation
Body Scan Meditation
Awareness of the Breath Meditation
Zen Meditation Meditation. Music video.