Is Sanmenxia to Kaifeng enough for two days?

That's enough. According to the query Ctrip Raiders show.

1. On the first day, I visited the iron tower in the north of Kaifeng, because this tower is a symbol of Kaifeng.

2. Visit Long Ting, not far from each other. In the afternoon, you can go to the Qingming Shanghe Garden, where there are many performances. After the tour, you can go to the Drum Tower Night Market to taste the famous local snacks.

3. Visit Kaifeng House the next morning. Although Kaifeng House has long been destroyed, the new Kaifeng House is still full of attraction.

4. After that, visit Jokhang Temple in the city center and walk to Baogong Temple nearby in the afternoon. You can go to Song Duyu Street to buy some souvenirs and take them back to complete the whole Kaifeng trip.