Just to let you know the Baltimore Bike Trails & Routes has been updated with a route to Sandy Point State Park as well as a route to Arundel Mills Mall.
Note: There is a sidepath on the north side of Arundel Mills Blvd if you are not comfortable riding in traffic.
Sandy Point: https://www.dnr.state.md.us/publiclands/southern/sandypoint.html
Arundel Mills Mall: https://www.simon.com/mall/default.aspx?ID=1230
Bike routes: https://www.baltimorespokes.org/staticpages/index.php?page=20070815081612328oldId.20071221200916256