You're required to return your old plates to the MVC. Interesting question if you can transfer your registration from the old plates to new ones, which you should because it is a like for like replacement for the same vehicle. Probably ask at the MVC when you go drop the plates.

The public library would be my choice. Easy to access, bright, and lively. Not too quiet, and not loud. Just the right amount of people around to not be distracted, or feel lonely. I enjoy going to Mamoun's but they do tend to get busy sometimes, so sitting there for a few hours might be frowned upon.

I've used the Motel 6 parking numerous times, and will use it undoubtedly in the future. The customer service could be a hit or miss, but the parking has never been an issue. Book online for better rates.