I am a block away from a university.Here is the dilema.

As soon as you see that two-day block, then you'd go into the calendar, click on "Availability Settings" then "Add another requirement" and change your minimum-stay requirement to only 2 days for those floaters.Be nice!

Block the garage as well.

What are your thoughts on blocking off the double doors and using it as a separate, private unit.

Are there any two-family homes on your block? 

As for a PM managing you can just block the time you want that is how it is usually done. however some PMs want a certain amount of prime time available or they don't want to manage it.

Do you know if it is concrete in between?

And anything within a block or so of the ocean is going to take an incredible beating from the winter weather salt air etc etc.. and then you have the Tsunami that is coming with teh massive earth quake that will come and that will wipe out whole towns on the Oregon coasts.

I've used Dennis Block for years, has always done a good job for me.  

Make sure you have an agent, property manager, and general contractor on your team that are very familiar with the area.Most of those neighborhoods are block by block.Where are you from?