Now that the work is accomplished in both the building of Solomon’s house and the building of the house of the Lord Solomon is able to sit back and reflect a bit on his work, and maybe even put his feet up. We find that in vs.12 he does offer up the burnt offerings that were required, and this was a daily task. He lined up all the Levites and all those who were commissioned to work in the temple so that the normal operations would happen in a way that was systematic.
We see in vs.16 that the work of Solomon was accomplished and that he then went to a place near the sea so that he could hang out there for a bit of time. He does sound like a bit of a normal person. Once the task is accomplished then rest is required and is desired by the Lord.