When we go on vacations, our routine is pretty much the same.
In the conversation, person's B problem is:
The weather is terrible.
The person feels sick due to something he ate.
He doesn't want to go swimming.
Person B feels sick but looks ok.
The pharmacy is ❌ the hotel.
The next day these people are going swimming will have fun riding horses are staying at the hotel's room( are going swimming, will have fun riding horses, are staying at the hotel's room ).
When you're on vacation, eating anywhere is not a problem because everything is very hygienic.