You can upload your files to 3DContentCentral.com (assuming they're not too big, and are free of errors). Then, once processed, you can re-download them as 2010 files (or any other file type.
3DCC would be a VERY popular place if it converted to older versions with features. Unfortunately it doesn't.
Welcome to the forum.
I would iges out your part and dxf out your drawing in 2011
then import them into 2010.
The only way is to export a dumb solid (in order of preference > Parasolid, STEP or IGES) and then use FeatureWorks (a feature recognition add-in) to rebuild to an editable part.
A dumb solid can be edited using the SW surface manipulation tools, but is not as simple as the regular features.
Thanks for the help everyone!