How to deal with traveling at one's own expense during business trip?

It depends on the nature of your job and the regulations of the company.

If you have enough private time and don't violate the company's system (especially the financial reimbursement system, you must be clear), there is generally no problem. After all, it is your personal time, as long as you don't delay your work.

(Tips: When sharing a circle of friends, it is necessary to explain that it is personal time, otherwise it is easy for colleagues or leaders to misunderstand, and you can also bring some small gifts with characteristics to your colleagues to share your travel experience. )