Even if you can't get it to snap, you should be able to Ctrl+select sketch entities and model entities and set relations. Is that working?
Nathan Trussell wrote:
I wan to snap my sketch geometry to points and edges from the first part.
Just a word of caution - When you snap to and edge, face or vertex of another part, you end up with errors if you make drastic changes to the first part. If you're doing in context modeling like that it is best to add a sketch part and snap to the sketch then another part in the assembly, however that sketch part needs to be the first part in the assembly...