Indigo would have been on my path actually, but I ended up staying at Element Lexington in Lexington MA just off of 95. They have a Chargepoint station here, works great. Hotel is mainly just a nice place to sleep, not much to do right around here, but its quite nice and Eco oriented and they save nice parking spots for the EV charger and for hybrids, so I recommend it.
I spoke to someone who said that when they first opened they had a couple of Roadsters for people to use as a promotional thing. And I'm not sure, but it seems like the charger is not charging my credit card like most chargepoints, which makes me wonder if they're also giving the electricity away for free. In any case it worked great for me.
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About the Nissan dealers - do all those dealers listed really have charging stations? And how much of a hassle is it to talk them into letting a Model S use it? I just kind of avoid Nissans when I'm making my maps. (Of course the fact that it charges relatively slowly, at least for just a pit stop mid trip, is part of it. It needs to be either a supercharger, or a hotel with a charger, or it does me little good. Except in an emergency I suppose.)