Precious metals. Gold and silver bullion are a good store of wealth over the long term. Note, however, that in the short term their prices can be quite volatile, so you must be prepared to ride out the sudden decreases (and increases) in value. Also note that by "a good store of wealth" I mean that the amount of goods and services you can purchase for a fixed amount of bullion stays roughly the same over time. A good investment, by contrast, yields returns greater than inflation, changes in currency value, purchasing power, etc.
You can purchase precious metals from coin dealers and directly from government mints. If you buy from a physical store (rather than an on-line company), pay in cash so you do not leave an electronic record. (In some countries bullion dealers have to file forms with the government for large purchases.) All dealers will charge you a small premium over the spot market metal price--they are running a business.
Because you mentioned SSI, I assume you live in the USA, so I recommend you look into old silver coins. Prior to the mid 1960s < http://en.wikipedia.org/wiki/Coinage_Act_of_1965 >, 10, 25, and 50 cent coins were made from 90% silver. A roll of 40 quarters (25 cent) from 1960 has a face value of US$10, and contains approximately 7.2 ounces of silver. Assuming a spot metal price of $17 per ounce of silver, this works out to about $122. If you took this roll of quarters to a coin dealer, they would give you roughly that amount. (Although they are no longer available in general circulation, 1960 quarters are relatively common, so there is little numismatic value beyond the silver price.) If you took that same roll of quarters to your local supermarket, they would only let you purchase $10 worth of goods with it. So what is the true value of that roll of quarters? $10 or $122? Hmmm.....
The biggest catch with owning physical bullion is you have to find a safe place (or places) to store it. Wherever you store it, you should not tell anyone because even if they are trustworthy, they might tell someone who is not.
Electronic or digital bullion < http://en.wikipedia.org/wiki/Digital_gold_currency > provides an alternative to owning an storing your own physical bullion. Be aware, however, that the regulations on this market are rather sketchy. Two of the more reputable companies are Bullion Vault < http://www.bullionvault.com/ > and Gold Money < http://goldmoney.com/index.html >. They will charge you fees for their service. Also, they are not "money laundering" outfits, so you will need to provide them with documentation verifying your identity, and transfering money into your account with them will leave an electronic record.
Finally, although you may want to convert your $11,000 worth of stocks into cash immediately, it would look suspicious if you suddenly withdrew all of that money from your bank account at once. (I believe that US banks have to file a form with the government for transactions over $10,000, but smaller amounts will still leave an electronic record.) In other words, hiding your assets will take time.