US Nationals can apply for the Tourist Visa, which is valid for 60 days, too as the Dominican Embassy USA link I attached:
TOURIST VISA:
Tourist Visas are issued for tourist, cultural trips, and for conferences or conventions.
The Tourist Visa is valid for one or multiple entries within 60 days of the issuing.
Posters have before enquired at their relevant embassy and been told it is not required and use overstay but that might change after the memo issued the other day as the recent post.
There are some people who said they would never issue "snowbird" type tourist visas. At least on paper it appears it is possible.