What are the methods for donating land?

There are several. One of the most common, of course, is outright conveyance, legally called a transfer in fee simple. There are other ways, however, such as:

• Transfers in Trust - you can convey your property "in trust" for the purpose of carrying out your wishes with respect to its preservation and use.
• Reservations of Life Estates - if the property is personal residence or farm land, you may make a gift of it but retain the use of the property for the rest of your life and, if you choose, the lives of your spouse and children.
• Bequests - estate and inheritance taxes can be reduced by willing property to the Land Trust.