My favourites:-
Of the sites being discussed, I prefer Gale crater (where I still think the central mound is a giant stack of hydrothermal deposits, rather than a structural rebound or an aeolian dump), and Eberswalde delta, which contains lots of real sedimentary rocks and depositional textures.
My favourite place in all of Mars is not on the list - Sysiphi Cavi, where I still think we see springtime gas-lubricated avalanches down the Gullies.