Stocks. Gold. Coffee can in the back yard. Real estate. Forever stamps!
I've done a financial analysis for you, so that you can spend your time doing summer things. Since all of the other methods have proved not-so-lucrative in recent years, I propose that we all sell our 401Ks and invest everything in the gorgeous new "Garden of Love" forever stamps by Jose Ortega. I mean, think of their value, when postage rates have increased to $1.25 one-ounce rate! And in the mean time, much prettier to look at than bond certificates.
Ortega says, "Garden of Love depicts the abundance of life, its generosity, whose spirit is to be shared by all its creatures. Love's definition is broader than romantic love. Love is that colorful, full feeling you get when you enjoy being a part of and sharing in the generosity of life." Almost as beautiful as his summery, fanciful art work, don't you think?