As a person who has worked in Xiamen for a long time, let me give you a way to save money and time.
Day 1: Take a rest when it is very hot at noon, then go to the beach in Baicheng, Xiamen University (you can swim), and then rent a bicycle to stroll around the island road, while riding, watching the sea view and blowing the sea breeze. It's awesome. Xiamen National Day is still quite hot, and it's very comfortable at the seaside.
If you are not tired, go to Zhongshan Road in the evening, where there are many delicious foods, the night view is beautiful, and it is close to the seaside. I remember there is a gourmet street next to Zhongshan Road (the intersection is near the interchange station), so you'd better go with an empty stomach, otherwise many things you want to taste and can't eat.
the next day: the traffic in Xiamen is very busy on national day, and it is difficult to get a taxi in some places. If you don't mind joining a group, you can sign up for a one-day leisure tour of Gulangyu Beach in Xiamen. (Including attractions: Nanputuo Temple+Xiamen University+Hulishan Fort+Gulangyu+Xinzhuang Garden) This is not expensive.
Day 3: I have two plans here: 1. One-day tour of Jimei Dadeng Island, which is very beautiful and close to Taiwan Province; 2. If you are interested in world cultural heritage, you can sign up for a one-day tour of Tulou, which is three hours away from Xiamen in Longyan, Fujian, and you can go back and forth with the group on the same day. It depends on your own choice.
Day 4: Many people prefer it. Then return to the hotel in the afternoon.
If you want to join a group tour, you can buy tickets in advance. I'll give you a group purchase network I bought for your reference. I bought Tulou six months ago, and the service is not bad. It's called Sesame Street Group Purchase Network. This is a local group-buying network in Xiamen, which is mainly engaged in Xiamen tourism and accommodation. You can look at the introduction, pictures, routes and prices of the scenic spots you want to go to online. Everyone has different expectations. Maybe you are not satisfied with what I am satisfied with. You can use it as a reference and think you can buy it again. The group tickets for the scenic spots I introduced are not expensive, adding up to more than 111 yuan.
In fact, many scenic spots in Xiamen are free of charge. Some tickets for you and the group are included, and we save trouble, right? Don't worry about traffic and finding a route.