Follow the link below to the ArcGIS Online map of Widewate State Park.
http://arcg.is/1aDGqj
The map depicts the location of the sensitive ecosystems, interesting wildlife sightings, and other interesting biodiversity features.
I preferred creating my map in ArcGIS Online over Google My Maps. My preference could be subjective simply because I have experience with Arc Online and I have a number of files in ArcGIS Desktop that is usable in the Online software. It is very easy to zip already existing shapefiles and upload them into ArcGIS Online. If you create attribute fields in Desktop such as acreage, miles, ecotype, etc. they will all transfer to Online. Once in the Online software you can choose which attributes will show in the Pop-up when the item is clicked Online. Creating features in Online is not as easy to do as it is in Google My Maps. The tool to create in Online is not as easy to locate and how to select the type of feature desired is not as easy either. ArcGIS Online is definitely geared more to the more experienced cartographer who has shapefiles created in Desktop already.
The map for the viewer is easy to use as well and has just as many features such as measuring tools and different basemaps like Google My Maps.
One feature I really like about is the ability to have an organization account. I have established a private group with my agency so that I may create and share my maps only with certain people. Co-workers can request or I can invite people to the group. This allows me to create maps with sensitive information that I can share with other employees who need access to that, but I do not want the public to have access to.