I would choose to go to the Amazon rainforest as an endotherm.
Endotherms, also known as warm-blooded animals, are capable of maintaining a constant body temperature regardless of the external environment. This includes animals like mammals and birds. They generate heat internally through metabolic processes, which allows them to thrive in various environmental conditions, including the extreme heat and humidity of the rainforest. Endotherms can regulate their body temperature through behaviors like seeking shade, bathing in water, or adjusting their activity levels throughout the day.
On the other hand, ectotherms, or cold-blooded animals, depend on external environmental conditions to regulate their body temperature. Examples include reptiles, amphibians, and many fish. They absorb heat from their surroundings and can struggle in extreme conditions, either overheating in the heat of the day or becoming too cold at night when temperatures drop. In the humid and heated conditions of the Amazon, an ectotherm might find it challenging to maintain adequate body temperature, as they would need to constantly seek out suitable microhabitats or risk being overly affected by the heat, which can lead to stress or even death.
Choosing to be an endotherm would provide an advantage in the Amazon's variable climate. I could remain active and explore the rainforest while being less vulnerable to the immediate environmental fluctuations than an ectotherm would be. Plus, my childhood love for the zoo could lead to a greater appreciation of the diverse, warm-blooded animals found in such a rich ecosystem!