No specific vaccinations are needed before traveling to Beidaihe. If you carefully research whether vaccinations are required in Beidaihe, you will probably find some recommendations. For example, vaccinations against hepatitis A and diphtheria are traditionally given.
Tourists entering the PRC from regions where yellow fever cases have been recorded require a certificate confirming vaccination. What other immunizations are required for traveling to Beidaihe? Check if you have a tetanus and typhoid vaccination and you will be fully prepared for this trip. All of the above vaccinations are not required, they are just a normal precaution.