National parks: Garajonay, Caldera de Taburiente and Timanfaya.
Pre-Covid: A sample of 260 visitors is selected during the period between October 2018 and February 2020, who are asked to answer a face-to-face questionnaire carried out by a qualified interviewer.
Post Covid: A sample of 1,113 visitors is selected during the period between July 2021 and July 2022, who are asked to answer an online questionnaire that they access through a QR code located at strategic points. of the three national parks considered.