If you are a Spanish national, you can consult the documentary requirements and health formalities you need to travel on the website of the Ministry of Foreign Affairs and Cooperation in the "Travel Recommendations" section.
If you are a national of any other country, you can consult your Consulate or Embassy.
In the event that you have contracted with a travel agency for a combined trip, the agency will provide you with information on the documentation and health formalities that are mandatory for your trip.