In the Chinese culture students often give "Red Envelopes" to the teacher to show respect for their learning experience. It does not matter what amount is given although there are theories about certain numbers. Generally it is a sign of appreciation. If you would like to support this work, Please donate what you'd like.
Even a small amount is a giving gesture that signifies your respect for the walks.
As important, I would like to hear about your experiences and your accomplishments since you started the walks. Please write me at ZhiHaiFS@hotmail.com