I am a last minute packer, so I will not pack for ours until Tuesday night or shortly before we leave on Wednesday. My MIL informed me yesterday that she is already ready to go.
Emma - Are you still working? If so, I don't know how you can get anything done being so excited and all : )
And it won't matter if it rains, you will have fun anyhow! Just bring or buy lots of those cheap ponchos. I carried two per person each day and would throw away the wet one rather than fold it up!