For a short-term holiday visit to Puerto Rico, is a visa, or visa waiver, required for EU citizens? (Finnish citizens, if it makes a difference.)
I’d guess it’s one of these (given PR’s special status as a US territory but not a state):
Like US “proper”, where you’d need the visa waiver / ESTA sorted
beforehand (pay $14, answer interesting questions about your 1930-40s
Nazi connections, etc).
Like most Latin American countries, where generally a visa is not required for Europeans (or you can easily get a tourist card upon arrival).
The visa requirements for Puerto Rico are exactly the same as for the USA (source). In other words, as an [Edit] ESTA-eligible citizen (most EU countries, but not all, see here), you ought to, in most circumstances, be able to use a visa waiver for a short term holiday by applying for an ESTA.