Yes do have fun. Sometimes one can get so hung up on catching all of the details and doing all of the 'musts' that fun and enjoyment is replaced by a sort of Diz-mania.
It won't be the end of the world if you miss some bits, and in one day you ain't gonna see everything, so enjoy it - one of the main pleasures in DLP (as already hinted at by Puss et al) is taking one's time.
We all have our favourite parts and really, it's up to you to discover your own - and have fun doing it.