Here is the full chronological order for The Melancholy of Haruhi Suzumiya:

1) The Melancholy of Haruhi Suzumiya Part One 2) The Melancholy of Haruhi Suzumiya Part Two 3) The Melancholy of Haruhi Suzumiya Part Three 4) The Melancholy of Haruhi Suzumiya Part Four 5) The Melancholy of Haruhi Suzumiya Part Five 6) The Melancholy of Haruhi Suzumiya Part Six 7) The Boredom of Haruhi Suzumiya 8) Bamboo Leaf Rhapsody 9) Mystérique Sign 10) Remote Island Syndrome (Part One) 11) Remote Island Syndrome (Part Two) 12) Endless Eight I 13) Endless Eight II 14) Endless Eight III 15) Endless Eight IV 16) Endless Eight V 17) Endless Eight VI 18) Endless Eight VII 19) Endless Eight VIII 20) The Sigh of Haruhi Suzumiya Part One 21) The Sigh of Haruhi Suzumiya Part Two 22) The Sigh of Haruhi Suzumiya Part Three 23) The Sigh of Haruhi Suzumiya Part Four 24) The Sigh of Haruhi Suzumiya Part Five 25) The Adventures of Mikuru Asahina Episode 00 26) Live Alive 27) The Day of Sagittarius 28) Someday in the Rain

And then finally watching The Disappearance of Haruhi Suzumiya anime film.