What is the cost to park during the week?

$10 or you can purchase an Empire Pass, it's good at all of the state parks for the entire year (2018) for $80.

$10 just like every day...

Unless you have an Empire Passport, parking is $10.00 every day through at least Labor Day. Prices change after that, and I believe it is free over the winter. If you are 62 or older, parking is free - during the week EXCEPT on a holiday.

$10 and I believe it's free after 6