Regarding this: ""He" may have not been "tired" but why the need to rest?"
The creation was complete in 6 days(or periods of time). It is a logical entailment to say that he rested(ceased) from the work when it was completed.
Regarding this: "Why create a planet with a 7 day week that needs "leap years" to correct itself?"
Leap year is due to the number of days applied to a year, not to the number of days applied to a week. Earth's orbit is 365.2422 days around the sun, which is what causes leap year. The Bible teaches that when sin entered the world, a lot of things changed in the environment. Assuming that leap year is bad, Earths orbit might have also been different at the end of creation before sin entered the world:
"Gen 1:31 And God saw every thing that he had made, and, behold, it was very good. And the evening and the morning were the sixth day. "
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