for Pacific being the one you play twice.
sunrise that time of year is ~7am and sunset ~7:45 pm.
guessing on 3/22 you'll walk off Old Mac, get on a shuttle, and pretty much walk straight to the tee of Bandon with time to grab a sandwich.
3/23 looks like you have time to sit down for lunch if you want. you might even be able to get on the Preserve for at least a few holes after your round if they have room....should be free since it would be your third round of the day.
how are you traveling? through PDX or Eugene?