2 different trees. 1 and 2. Prunus sp...a cherry....wcutler may pin it down further. 3 - 6.....Cercis sp.
The first is one of the Chrysanthemum-flowered ornamental cherries. The habit looks like one we have here called 'Pink Perfection', but the colouring doesn't look right and the flowers look a little too small and have too many petals to be that. The second tree is a Redbud. I'd say Cercis siliquastrum, which comes from your area, but those bilobed leaves make me wonder. Cercis occidentalis is supposed to have bilobed leaves, but it's from the western US. Of course, park trees can come from anywhere.
One possibility is Prunus 'Kiku-shidare-zakura', which is supposed to be weeping, so I originally rejected that as an ID. I saw some today, though, that reminded me a lot of this tree.
