Going to the seaside is free. 5 yuan can rent a circle every time, just like renting an eraser and 20 yuan renting a bicycle. Hourly 10 yuan. At night, two people can ride and go to Tiger Rock to see the night scene.
Tickets for Tiger Stone Park 15 yuan. Open at night,
The ticket from Xinxiang to Beijing is around 70 yuan, and the train from Beijing to Beidaihe is around 70 yuan. 70 yuan can stay in 90 yuan for one night.
Going to Beidaihe should be mainly about swimming in the sea and eating seafood, and everything else is useless. Especially in Changli, it's not fun at all except sand skiing. One ticket to 65 yuan is too expensive.
As for the Nandaihe Entertainment Center, you don't have to go. You can go to Happy Valley in Beijing. The ticket 160 is a pass. There are too many projects to play, which are too exciting. Too scared. Roller coaster, etc. It should be the most interesting place in China. You can get an annual ticket, 300 yuan. You can go every day of the year.
If you can't play all day, you'd better not go on weekends.