It was held on 420 acres (1.7 km2) of countryside adjacent to Los Tubos beach in Manatí on the north shore of the island.

One exception was New York Times reporter Les Ledbetter who printed a column on April 9 titled "It was a success – ask the people".

[citation needed] The designated area for Fiesta Del Sol/Mar y Sol was mainly in the countryside and extended to the Los Tubos beach.

The coordinates are: 18°28'20"N 66°26'46"W.[7] These are the performers for which there is evidence (audio, photos or multiple witnesses) that they did play at the festival: John Lennon wanted to attend the festival along with his wife Yoko Ono but ended up not flying down to the island due to problems he was having with the government at the time regarding their attempts to deport him[citation needed].

[citation needed] During his performance (April 2) and after a short introduction, David Peel played the tape to the audience which was mainly greetings from John and Yoko.

[citation needed] But his performance at Mar y Sol electrified the crowd and gave a major boost to his career.

[citation needed] "His performance was brought to the attention of Clive Davis, the head of Columbia Records, who was impressed with Joel's artistry."

Alex Cooley also had Eric Blackstead, producer of Woodstock: Music from the Original Soundtrack and More, as his audio consultant.

The album Mar y Sol: The First International Puerto Rico Pop Festival was released in 1972 by Atco Records.

There's also a 3 CD series of audience recordings by attendees Pedro Collazo and Oscar Mandry (from Ponce, Puerto Rico) called "The Collazo/Mandry Tapes" which was edited and prepared by Mar y Sol Festival's historian, Reniet Ramirez, for free online distribution.

King, Brownsville Station, Dave Brubeck (w/ Gerry Mulligan), David Peel and the Lower East Side, Faces, Fran Ferrer y Puerto Rico 2010, Herbie Mann, J. Geils Band, Jonathan Edwards, Nitzinger and Pot Liquor.

[8] In 1982, in celebration of the 10th anniversary, a concert was held in San Juan, Puerto Rico called "Remember Mar y Sol".

As opposed to Woodstock and other similar music festivals from those days, the subject of Mar y Sol was quickly forgotten.

[11] On Saturday March 31, 2012, while filming an amateur documentary about Mar y Sol, historian Reniet Ramirez, hosted an improvised gathering (including festival attendees as well as younger people who are enthusiasts of the subject)[12]