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.

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.