You need an embassy visa for U.S. Virgin Islands if you have a Brazilian passport
Visa options for U.S. Virgin Islands
Visitor visa
Travelers need a visa to visit United States Virgin Islands for Business or Tourism. A paper or embassy visa is the only visa available for travelers visiting United States Virgin Islands. The visa is typically a stamp or sticker added to the passport. Travelers must obtain this visa from a local embassy, consulate or visa center before traveling.