I just recently bought a house in Gosnells, moved in last November.
Have gone for a few walks, nothing fantastic to see. I moved from Armadale and walked quite regularly around the area, parks etc. I think it is safe walking around Gosnells just there is not to much to look at if that helps.
There are great walks around the Southern and Canning river reserves and there are many open spaces and parks close to most houses. Pioneer Park is also nice as is the Railway Markets. Depending on where you live there is some form of shopping centre within a few KM's walk