Robin, being an Art history major, LOVES going out to the museums, and he also has an obsession with cathedrals. Since he's practically new to the city where they are staying, he asked Dani if he wanted to come with him to see the local museums and cathedrals. But ofc Mexico being Mexico, and not having a car, they walked and ended up beaten by the heat.
These kinds of times are when Robin rambles the most.