I'm glad that soon you will have the opportunity to be with your nephew and spend time together.
I remember, when my brother came with his family to his hometown a few years ago, and my nephew wanted to spend time with me (so that his parents could visit whom they had planned), we had time for ourselves.
If I hadn't made a detailed plan of activities on those days, it would have been difficult for us to achieve everything he wanted to do and see with me.

First, I took days off at the company (announced it well in advance), planned all the interesting things that would keep his attention (such as BMX descents keep the attention of Mr. B), because my brother told me that he doesn't really have an excessive interest in something new, because he is not used to innovations.
So how can he get used to it, if he doesn't have the opportunity?
So we made...
Trip to the fortress, archery, adventure park with zip line, amusement park with cars and a panorama, Zoo, terrarium, video games, 6D cinema...
A lot of these planned activities fit into our days together.
I only remember that my brother told me that my nephew slept really well in those days, as soon as he lay down in bed, he immediately fell asleep.

I was the same way, tired from chasing the kid 😀

Be careful when you follow him in activities, for their rhythm you need a lot of energy and fitness 😄