1. La Caldera is a natural reserve located in the center of Tenerife, Canary Islands. It is a volcanic crater that was formed thousands of years ago and is now covered by lush vegetation. The reserve has a unique flora and fauna, including some endangered species. It is a popular destination for hiking and nature walks, with several trails leading to viewpoints and lookout points.

2. The reserve is open daily from 9 am to 4 pm. The phone number for information is +34 922 535 828.

3. Admission to La Caldera is free of charge. The reserve is accessible by car or public transportation, with bus routes available from nearby towns and cities. However, visitors are advised to wear comfortable shoes and bring water and sunscreen as the trails can be steep and challenging.