Summer activities Istanbul

Hi all
i enjoyed winter  here in this beautiful city but i hope to get some good advises from you about where to go and wat the best to do in summer here in Istanbul... thanks in advance

Actually there's a lot of concerts helding in Istanbul, so if you into Metal-Rock I mean those kinda stuff U can always check the facebook or BandIntown

for me I will go to Van, Sapanca, Bolu, Bodrum, Belik (Antalya)
This will be my summer :)

thanks Zaıd
ı prefer beach partıes ın summer and was thınkıng ıf ı can fınd somethıng closer than Antalya.. but wıll lok for these optıons and thanks agaın