The next day: a one-day tour of Daigu Island in Jimei (Daigu Island is known as the most beautiful island in Xiamen). It is said that Daiyu Island is the nearest place to Taiwan Province Province (this remains to be verified, hehe. . . I heard that, too. When you are visiting Xiamen, you can go to Zhongshan Road in the evening. There are many special foods there, such as frozen bamboo shoots and fried seafood.
Day 3: One-day tour of Yongding Tulou. It's better to join a group here. This is a mountain road, which is not easy to walk. I've been to Tulou with the delegation that day, and the world cultural heritage is still worth seeing. If you are not interested in ancient culture, you can ride a bike around the island on this day. The scenery is great. You can ride to the exhibition center from Baicheng or Mingzhu Bay of Xiamen University. The scenery was beautiful all the way.
Day 4-7: Four-day tour of Wuyishan. Main attractions: Feng Tianyou, Yixiantian, Roaring Tiger Rock, Dahongpao, water curtain cave, Jiuquxi Rafting, Wuyi Palace, Xiamei Ancient Residence, Longjing Mountain, Da 'anyuan, Wuyiyuan, Qinglong Waterfall, East China First Rafting, etc. Booking in advance is required for rafting. You may not need to go there at ordinary times. It would be better if you came to Wuyishan in summer. Wuyishan may be cooler than Xiamen, so wear more thick coats. )
Cost: Wuyishan above may be more expensive. You can consider buying tickets and accommodation for scenic spots, which will save some money. I can introduce you to Sesame Street Group Buying Network. I bought Yongding Tulou online six months ago. I think the service is ok, mainly because the price is affordable. You can go up and see the services, routes and prices of the scenic spots you want to visit first. You can try it if you think it's appropriate. Have a good time.