“Have you visited them?”
Here them refers to the one person Frank mentioned, someone who lives there. They and them are also used for a single person when you do not specify gender. In other words, "Have you visited that person?"
A2-08 / CEFR A2 / EPISODE 08
Talking about travel experiences
SceneDiscussing travel at a café.

WORDS & CONTEXT
Here them refers to the one person Frank mentioned, someone who lives there. They and them are also used for a single person when you do not specify gender. In other words, "Have you visited that person?"
Describing people, warm is not about temperature; it means friendly and welcoming. Because Frank compares the people with Tina's home planet, Tina clarifies: friendly, not hot.
Leave something alone means not to touch or bother it. Tina wanted to eat flowers in A1-11, so Frank checks that she did not try to eat any in Hawaii. The final for the flowers is a joke: it was a safe trip not only for Tina but also for the flowers, which escaped being eaten.