I know not every state has a WWII sub that people can go visit and explore, however every state should have a memorial for a sub with WWII sub merorabilia.
Since 52 boats went down, the U.S. SubVets allocated each states subvet chapter a boat to memorialize, so every state should have something related to WWII subs.
Here is the SubVets website, and click the link for memorials, or click look for state chapter and go to the website and see if they have a memorial.
www.ussvi.org