Thailand Chill-Out: Koh Phangan Adventure (Sept 2-7)

My buddy and I are heading to Thailand for a relaxing getaway from September 2nd to 7th!  We're flying in from India and are super excited to explore Koh Phangan.  Our plan is to chill out, dive into some amazing scuba diving experiences, sample the local delicacies (and maybe some tasty gummies!), and enjoy the vibrant nightlife.  We're a little unsure about the weather in early September, so any tips on what to pack would be awesome.  Any recommendations for must-see spots, hidden gems, or the best places to grab a delicious meal and refreshing drinks on Koh Phangan are greatly appreciated! We're open to all suggestions – we're total newbies when it comes to planning this trip, so your insights would be incredibly helpful.  Plus, any advice on navigating Thailand's increasingly popular cannabis scene would be a bonus!  Let's make this a trip to remember!