The second theme is minor, so play more intensely. Dynamic contrast is a key in Beethoven. Bring out the pianos and fortes, with much contrast. There is something sacred about this movement being in two. Don't interfere with this.
Every phrase has a main note, know which one it is.
Every note must either be going somewhere or is a point of arrival. Don't do too many ritards since Beethoven already wrote them out with longer note values. Don't let the bow get stuck on the string with the same bow speed. Never play a phrase in which every note is equal. Automatic vibrato brings all colors together when you actually want to pull them apart.