@REI-EricP Congrats that is so exciting!  When I first found out I was going to have a little one I bought all kinds of things that I never used so it is great you are asking first!  I would say the best thing to be comfortable in any setting outdoors is a good diaper bag.  You need something that can be a sling or a backpack and can also hold a few toy distractions, snacks and water for you and those all essential diapers.  It is amazing seeing all of the things in nature again through the eyes of a little one.  Enjoy!!