Yes, the pink dots are normal tenting campsites. (They turn red after they have been reviewed.) 

Voyageurs National Park has photos of all of the campsites - http://www.nps.gov/voya/learn/photosmultimedia/campsites.htm

I'll be incorporating the photos and descriptions into this website at some point. Going through VNP campsite list is how I found out I don't have all of the campsites (I think) or have some mislabeled as anchorages and should be campsites. I got my original campsite data from the VNP site - the KML file on http://www.nps.gov/voya/planyourvisit/maps.htm. Apparently the data in the KML file doesn't reconcile with the campsite photos. I'll have to cross-check it against the GPX file they have on the site as well - http://www.nps.gov/voya/planyourvisit/gps-waypoints.htm.

Not your fault - I haven't put them in the key. I am planning on adding a button for map and area notes (each area has its own quirks), but I haven't gotten to it yet.

Short answer:

Green triangles are day use areas
Blue dots are house boat anchorages

Explanation:

When I got the campsite data, I noticed that it had a lot of campsites but then realized not all of them were "traditional" campsites. Adding a campsite "type" in my system is a really long process. In order to not have to add a new type (and hence a new entry in the legend), I just made the icon different. The functionality isn't as comprehensive as a new campsite type, but it involved a lot less work and let me get it up sooner.

I am still trying to fix up some of the campsite data. I don't think the data I had was completely up to date - I think there are a few campsites I am missing. I am also working on getting the official campsite numbers/designations put in. I have some of them entered, but not all yet.