Are you going to be traveling in populated area? Is your laptop a netbook or at least fairly light and compact?Do you plan on doing a blog or CGOAB journal? If the answer to these questions is YES, then IMO you should take the laptop. Also, you are going to be stopping for weeks long periods and you won't have a cell phone? I definitely recommend the laptop.
I've brought a laptop and wished I hadn't. It was an old 12 pounder and the enormous weight wasn't quite worth the benefits. For my next tour I purchased a 3lb netbook. Loved it. Made getting online much easier. I think there are more cafe's with wifi around than libraries now.