All of these items are on a time clock.   

This process can be very costly, requires zoning permission, in addition to all the items you listed.

Like games, outdoor items that fit the area, and other similar items.

Questions:1) What items should I focus on renovating if I need to INCREASE the house value?

These items are just as important as insulating,...probably more important. 

I look at figuring what is the next big ticket item going to cost.

Overall mostly cosmetic items.

Mortgages are the largest debt line-item for households.

This will show up as a line item in the final price for customers. 

Since rarely are properties on the Oregon Coast (or anywhere for that matter) in flawless condition, generally post receipt of the inspection report there are items of concern that buyer(s) will want repaired or compensation towards.