Want a conservative investment that will keep pace with inflation?
How about an investment that is exempt from State and local taxes if you are a US citizen?
Then the Series I Savings Bond issued from the US government might be of interest to you. No, it is not like the old Series EE Savings Bonds that some nice adult might have gifted you when you were a child. This is a bond that the interest rate adjusts along with inflation. With a maturity period of 30 years, it cannot be cashed in within the first 12 months of purchase, but if you hold the bond for five years or more there is no penalty. Throw in the State and local tax exemption which should be of particular interest to high-tax states like California, and you may have a winner.
Here is an excellent video for more detail: