My favorite teachers were the ones that wanted or at least seemed to want to be in the classroom everyday. There were too many of them that were their for the paycheck and it showed.

And speaking from hindsight as a more mature individual, don't be their friends. We had those teachers and that quality was exploited until the entire classroom experience had been stripped away in favor of accommodating the needs of the students instead of the requirements of the curriculum.

Just be there, enjoy it and share that with your students.