Final answer:
Charlie disliked vacationing in Dover, Delaware, which is often associated with credit card companies and financial services, contrary to the restful vibe sought in vacations.
Step-by-step explanation:
Charlie's least favorite place to go on vacation was Dover, Delaware, which is known as the credit card capital of the United States. This might be attributed to Dover's association with financial services and possibly a high volume of credit card mail which might not evoke the leisure and relaxation typically desired from a vacation. As Dover is an epicenter for credit card companies, many Americans associate it with bills and financial obligations rather than a place for rest and recreation.