Why don't you try some of the easier Chopin pieces (Preludes no.4, 16 or any of the easier waltzes of Nocturnes)
I really think you meant no. 6, not 16.

Okay. I guess I won't be lazy anymore and I'll give you a solid answer. I learned the first movement of moonlight a couple years ago, but since then my practicing/playing/having a teacher has been very sporadic, due in part because I'm in college and cannot find/make solid time to practice regularly. With this in mind, and the fact that I don't have a teacher at the current moment, I decided to go back to the basics and appreciate many composers' smaller works. Ones that aren't as musically or technically challenging. Check out the thread "What are you learning now?" to see what I mean. Now... pieces that I can think of that are around the difficulty of the first movement of moonlight.....
By Beethoven... Sonatas Op. 49 Nos. 1, 2... Fur Elise... Some of the Bagatelles.
By Bach... Two Part Inventions and some of the Sinfonias. Great choices. A must for any pianist.
By Chopin... Preludes 4, 6, 7, 9, 13, 15, or 20. Nocturnes 9/2, 72, Op Post in C Minor and Post. in C# Minor. Waltzes 34/2, 69/1,
By Haydn... Sonatas 7, 8, 9, and 13.
By Liszt... The Consolations. Beautiful works, the third in particular.
By Mozart... Sonata k.545, Fantasia in D
By Schumann... His pieces from Album for the Young and some of the Scenes from Childhood.
It honestly all depends on you... your likes and dislikes, and what you are in the mood to learn.
