Add beaches (http://wiki.openstreetmap.org/wiki/Tag:natural%3Dbeach)
Area for NMC
Maps paths in the Commons
Map buildings in the Commons
Bike lanes / routes
Check churches
Add some buildings (http://wiki.openstreetmap.org/wiki/Building) (http://wiki.openstreetmap.org/wiki/JOSM/Plugins/BuildingsTools)
Check road names in the Commons
Discussion