Samsonite! I was way off!
Saw the themer answers, but missed the hidden state, less the first letter. At first I was intrigued by using the first letters of the words in the themers to create a state abbreviation, Leans Aside (LA), I'll Ask Around (using one A gave IA)... but No Walk In the Park and Octahedron really didn't fit, though I considered WI and OH there, but this wasn't tidy enough...
Then, I noticed State Abbreviations all over the place, so determined that what looked like our normal themers, may not be themers at all. And thinking about the phrasing of the title, Sail On, O Ship of State, it struck me as a sort of eulogy/ode to a since-decommissioned or destroyed naval ship. So I went through the grid, both East-West and North-South, and pulled every two letter state abbreviation, eliminating duplicates, and entered those into Excel as rows, and then determined the Class of Battleship each belonged to. From there, I created a pivot table, to get the values of each class. Based on the clue for the central answer "A score between -1 and +1 (Even Par), I determined I was looking for a loner, a result that yielded only a single entry, so I narrowed down the classes of retired battleships, that only had a single state entered. That gave me California, Colorado, Maine and Wyoming. California, Colorado and Maine are all in the grid, meaning they showed in my table as both a Ship and a Class, whereas Wyoming was the only Class of Ship, with a single former US Battleship named after a State that resulted. Ergo, my submission was "Wyoming"
My nit with the official answer is that an Umiak is far from a "ship"
Even if I had spotted the incomplete state names, I would have felt about as sure of a lock on Alaska, as I felt in Wyoming, due to a disparity between canoe and ship, if I were to even get to that point. Not sure I would have even googled Umiak, to be fair.

If you see me on the beach, feel free to pm for a nudge. After all the help I’ve got, I am happy to send it forward when I can!