Can You Identify This Plant?

Plants are starting to emerge around my house, and I have no idea what they are.  

Scilla "Spring Beauty," brightening up the dead leaves in my border.

Scilla "Spring Beauty," brightening up the dead leaves in my border.

This bums me out, because I used to have a greater working knowledge of plants.  This was back in the 1990s, when I lived in an apartment in Boerum Hill, Brooklyn that had a little backyard garden.  I'd spend hours flipping through White Flower Farm's luscious catalogues and write up wish lists.  I knew that the scientific name of grape hyacinths is Muscari and looked forward to the nearness of spring by spotting Chionodoxa "Glory-of-the-Snow" in bloom.   

Now, though, all these years later?  I'm looking at these shoots and scratching my head.

Friends, gardeners, help me out by naming that plant!  Bonus points if you can tell me when it will be in its full glory.

Name this plant #1

Are these peonies?  I sure hope so.  They're my favorite flower.

Name this plant #2

This looks to me like the start of a Columbine flower.  It's on the north side, the shady side, of the house.  Columbine reminds me of a bicycle trip I took to the north rim of the Grand Canyon in Arizona.  They were all over the place.

Name this plant #3

I have no idea what this is.  Bigantus plantillium? 

Name this plant #4

This appears to be a weeping cherry tree, but what variety?  The flowers are a pinky-white.

Thanks for any help!  And if you can come out and help me prune, weed and pick up twigs and fallen branches, I'd say the nicest things about you for a very long time.