icing on the cake

(noun) an attractive but unessential addition to something

Example Sentences:

I love being an English teacher. The icing on the cake is meeting so many fun people!

Vancouver is a beautiful place, with nature and scenery and many beautiful mountains. The icing on the cake is the friendly people!

From the Blogs:

Third straight win is icing on the cake for Sabres

Media:

Similar idioms:

1. you can’t have your cake and eat it too
2. set the record straight
3. piece of cake