The optimum way to pay for goods and services is national currency as any other currency may be denied in local shops and establishments. The currency should better be exchanged at home before a departure as in this case one will get the most profitable currency exchange rate. It should be noted that San Francisco lacks currency exchange offices which are rather challenging to find.
When on shopping tourists should not keep much cash by themselves as the city of San Francisco has adopted a system of cashless transfers. That is why the best way for payments is to get a multi-currency Visa credit card for a trip.
Utility supplied voltage varies from 110V to 127V. Some electrical appliances may need special connectors and adapters. In large hotels these items are provided at the request. Adapters and connectors can be bought in any specialized household store.
Tourists should keep in mind that alcohol drinks and tobacco goods can be bought only in specialized stores. These goods are sold only to customers after 21 years old. That is why young people should keep documents of identification by themselves to avoid misunderstandings and some embarrassing situations.
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