It's possible Polynesian visited Galapagos Islands since the islands itself is on the way to Colombia, Peru and Ecuador from Easter Island (Rapa Nui) and Marquesas Islands however they found out soon that the islands were an inhospitable place to stay since it lacked basic necessities to survive such as fresh water. Galapagos Islands are only 605 plus miles (974 kilometers) away from Ecuador, South America.
On the other hand, it's also possible that seafaring Polynesians didn't visit Galapagos Island if they took the coastal route either from Chile to Peru, Ecuador and Colombia or another route which was Mexico to Central America to Colombia, Ecuador and Peru. Sailing on a sail boat to South America depends on the direction of the trade winds which is seasonal however they were experts at seafaring.
Where are the Galapagos Islands Located? (naturegalapagos.com)
Galapagos are an archipelago of volcanic islands located in the Pacific Ocean right in the Equator Line, 605 miles to the west of South America.
Although fresh water is not very visible in Galapagos, it is found in several places (underground, crevices, and streambeds) and is indispensable for all forms of life.Historically, Galapagos residents barely survived, having to search for water (rainwater, brackish water, and springs).
Native South Americans visited Galapagos Islands?
Pre-Columbian era
Whether the Incas ever made it to the islands is disputed. In 1572, Spanish chronicler Pedro Sarmiento de Gamboa claimed that Topa Inca Yupanqui, the second Sapa Inca of the Inca Empire had visited the archipelago, but there is little evidence for this, and many experts consider it a far-fetched legend, especially since the Incas were not seafaring people. According to a 1952 archaeological survey by Thor Heyerdahl and Arne Skjølsvold, potsherds and other artifacts from several sites on the islands suggest visitation by South American peoples in pre-Columbian era. The group located an Inca flute and shards from more than 130 pieces of ceramics, which were later identified as pre-Incan. However, no remains of graves, ceremonial vessels or constructions have ever been found, suggesting no permanent settlement occurred before the Spanish arrived in the 16th century. A 2016 reanalysis of Heyerdahl and Skjølsvold's archaeological sites rejected their conclusions. They found that at all locations, artifacts of Indian and European origin were interspersed without the distinct spatial or stratigraphic arrangement that would be expected from independent sequential deposition (indeed, Heyerdahl and Skjølsvold had reported the intermixing of European and American artifacts in their original report). Radiocarbon dates from the sites placed them in the historical (post-Spanish-arrival) era, and preliminary paleoenvironmental analysis showed no disturbance older than 500 years before present, suggesting the islands were probably not visited prior to their Spanish discovery in 1535. The authors suggested that native artifacts found by Heyerdahl and Skjølsvold had probably been brought as momentos or souvenirs at the time of Spanish occupation. Whatever their identity, the first visitors to the islands were likely unimpressed by the lack of fresh water on the islands.
European voyages
European discovery of the Galápagos Islands occurred when Spaniard Fray Tomás de Berlanga, the fourth Bishop of Panama, sailed to Peru to settle a dispute between Francisco Pizarro and his lieutenants. De Berlanga's vessel drifted off course when the winds diminished, and his party reached the islands on 10 March 1535.