Consider buying turn-key single-family real estate that is rented, managed and appreciating! There are firms that offer a way to take advantage of fairly liquid investment properties that you own and they manage. These firms take the effort out of finding undervalued properties, renting and managing the properties, and so most of the guesswork is gone. They provide a hands-off investment for the investor, although you will still have the basic risks associated with owning real estate.
Bottom Line: If you work with a firm that offers the product in areas you like, have a comfort level with a third party firm managing your real estate, this is a good way to go.