Ok...I may not be so good at some of these questions
"What kind of snack and juices are available during labor?"
There is a kitchen on each floor 4/5 with sandwiches, various juices, fruit, cheese, etc. How well it is stocked at any one time depends on the time of day and how busy the unit is. If you can't find something, your support person can go to the other floor and check that kitchen. The CNMs don't have a problem with you eating during labor (unless you get an epidural, obviously, then anesthesia says 'No')
"And I'm a bit confused where we go once we get to the 5th floor"
Go straight to triage on 5th floor. When you get off the elevator, you are at the nurse's station and will be directed around the corner to triage anyway....not a problem.
"Also, do they validate for parking while you are in labor? Most hospitals don't charge patients for parking, just visitors"
Yes, you can get parking validated. I am a little more shady on the actual rules for doulas/visitors. If they go to guest services on their way out (on 2nd floor), they will probably be able to get it validated. I don't know much about the valet service, as it just started recently and I work evenings...it doesn't run then.