I'd do nothing but reading if I could (ok, maybe eat some great food, buy some fancy shoes between two books...oh, and spend some quality time with the gorgeous guy I married while I am on reading-break anyway...)
Miss Marple is a great character and very different in the books than the picture I have in mind from the numerous movie versions.
The plot was well-thought out and had a surprising twist at the end - in retrospective, like always with Mrs Christie, it all made perfect sense.