YW - I can only really talk about post-delivery options, never having laboured, but second time around I made sure I had loads of drinks with sports cap lids, naice foods too!, lansinoh, the ipad charged and full of downton abbey episodes. If you do end up with intervention then you may not have much ability to move around and if the delivery is late or outside visiting hours, you could find yourself alone after moving to post-labour ward. So factor that in possibly and make sure everything can be accessible if you can't move for any reason. Second time I knew what was coming so had the snacks and nappies set up, ipad on, and BF'd almost constantly through that first night.
S also "bought" DD a present - colouring book and chocolate buttons for her to unwrap when she came to visit. This went down very well and is still remembered by DD.
Oh, and despite J having always been your baby, when you see him for the first time after delivering his sibling and having newborn cuddles etc, don't be surprised that J has suddenly become a total giant child.