Easter/Ostara - I know they are not the same thing, and I don't celebrate either as the followers of their respective religions would. But there's just something about that Spring celebration of re-birth, the Earth coming back to life, to me it symbolizes a new beginning and triumph over death (winter). I love all the natural imagery associated with it, such as, flowers, bunnies, baby chicks. There is an innocence of life that only happens in the Spring, and we should celebrate that.
Also, I have good memories of Easter from my childhood. Yeah, Christmas was great, but even children know it is a stressful time, and Easter is less so. At least it was for me.