Can the tour guide impose extra charges during the tour to make illegal gains?

according to the current laws and regulations, there is no so-called crime of "illegal enrichment", and the public security organs can't file an investigation on citizens for the crime of "illegal enrichment" and pursue their legal responsibilities. However, if the tour guide forcibly charges extra fees during the tour, as a tourist, he can refuse. If the tour contract stipulates that no extra fees can be charged and the corresponding liability for breach of contract has been agreed, the breaching party can be required to bear the corresponding liability for breach of contract according to the contract and relevant laws and regulations.

relevant laws and regulations: article 17 of the contract law of the people's Republic of China

if a party fails to perform its contractual obligations or fails to meet the contract obligations, it shall bear the liabilities for breach of contract such as continuing to perform, taking remedial measures or compensating losses.

article 18 if one of the parties expressly expresses or shows by his own behavior that he will not perform the contractual obligations, the other party may require him to bear the liability for breach of contract before the expiration of the performance period.