Comments

If you tell what your wish was it doesn't come true -_- you're going to be waiting for that unicornot for a long time, fam.

If there are spikes, there won't be any homeless people around so there is really no use leaving a cot/food. Also, because those spikes are most likely on private property, you could get charged with littering/tresspassing by leaving cots/food.
Your heart's in the right place, but things like volunteering at soup kitchens will help more people. See if your school/place of worship has anything on their bulletin board for volunteer work :)