I went for my honeymoon! Defo do a boat ride. My favourite places were Bellagio and Varenna. I personally think Nesso is a hidden gem. As long as you're physically fit, it's well worth the walk down the steps. There's a water fall, a lovely bridge, and you'll be right beside the water.
The Star Wars villa is lovely! There are a couple of others lovely villas to visit too.
Honestly it's just a stunning place- the main draw to Como is just sailing/walking around and soaking in the incredible views and quaint towns/villages.