A holiday on the Acropolis

Who doesn't want to have a holiday on a mountain in the clouds with the Greek gods. There is a lot going on here: Here you can visit the temple of Athena, BBQ with Zeus, sunbathing with Athena and eat an ice cream. But oh no who is that with his seahorse, it is Poseidon, the god of water, and he is angry. Can you find out why he is? (a hint: look at the BBQ)