I think it is sufficient if you spend one day. I spent one day.

Мы заезжали в Лихтенштейн через Швейцарию на машине. Честно говоря, не знаю, где пересекли границу. Никаких документов никто не спрашивал. Потому и никаких штампов не ставили.

When facing the City Hall take the stairs down on the left side of the building. Look straight and to the left a little and you’ll see toilets and the lockers. There are nine big lockers and four small ones. Cost is €2 or CHF 2 for 24 hours - coins only (does not accept 2F coin only 1F or €1, €2, & €0.50)

olá ,acredito que não haja guarda volumes ,pois é uma loja de informações turísticas que também funciona como venda de souvenir e o tradicional carimbo alfandegário no passaporte (pago).Abs

Oi Amanda, infelizmente não conseguirei te ajudar porque como eu estava de carro, não me preocupei com isso. Confesso que nem vi estação de trem ali perto, onde normalmente possui esse tipo de serviço. Tem um informações turísticas bem no centro, eles possuem site e na época enviei email perguntando de preço de estacionamento e eles me responderam rapidinho. Manda uma mensagem perguntando porque pode ser que eles possuam. vaduz.li

Liechtenstein has an agreement with the Swiss for freedom of movement between the borders so there are no formal border controls if entering from Switzerland under the Schengen agreement, provided you have valid travel documents for Switzerland. However, due to recent problems with attempts by illegal immigrants to enter the country to claim assylum, the Liechtenstein government are undertaking more spot checks, particularly on buses entering it's borders. So as there is no formal passport control between Switzerland and Liechtenstein, to answer your question, yes it's more of a souvenir stamp.

There are many less urban towns than Vaduz with traditional style buildings etc in Liechtenstein but Schaan is your best bet as it's easy to reach from Vaduz. Not tried any of the hotels though.