US travelers entering Lichtenstein do not need a visa. The country is part of the Schengen Agreement, so American visitors along with a host of other developed countries may enter for a period of up to 90 days with a valid passport. Peruse the government website for further information on access at http://travel.state.gov/visa/.
Health and Safety
When it comes to crime, Liechtenstein has one of the lowest recorded levels in the world. This may have something to do with the country being one of the wealthiest per-capita nations on Earth, or its extremely low employment rate. Of course, tourists should always exercise caution when walking at night, and stay in groups if possible.
There are generally no diseases or illnesses of concern in Liechtenstein. However, it is not uncommon for doctors to give you a vaccination for tick-borne encephalitis. Having an up-to-date tetanus shot is also recommended.
With the alpine landscape, snowy conditions can cause injuries while hiking or skiing. The hospitals and medical clinics are extremely well run, although they can be expensive. Tourists are advised to purchase full-coverage health insurance before arriving in Liechtenstein.