What are they doing? (camp)
They are (going) camping.
What are they doing? (snorkel)
They are snorkeling.
What are they doing? (ride)
They are riding a roller-coaster.
What are they doing? (read)
They are reading (a book).
What is she doing? (write)
She is writing a postcard.
What are they doing? (row)
They are rowing a boat.
What is he doing? (build)
He's building a sandcastle.
What is she doing? (pack)
She is packing a bag (suitcase).
What are they doing? (take)
They are taking a sightseeing tour.
What is she doing? (take)
She is taking a photo.
What are they doing? (take)
They are taking a photo (selfie).
What are they doing? (swim)
They are swimming in the pool.
What are they doing? (swim)
They are swimming in the pool.
What are they doing? (play)
They are playing volleyball.
What are they doing? (play)
They are playing at the beach.
What are they doing? (camp)
They are (going) camping.
What are they doing? (stay at)
They are staying at a hotel.