Travelling to HK between 20th and 28th - need tips

Hello! I used to live in HK and now I’m coming back after nearly 9 years. It used to be cold in March, should I still bring a jacket?

Also, must do food/hikes/other activities? Suggest only local, interesting things to do, I’ve done the big Buddha and all the touristy things while I lived there.

Also, there was a dish I had at a restaurant while I lived there - it was a bowl full of chillies and you could customise the ingredients you wanted stir fried into the bowl, veggies, meats etc. I don’t know what it’s called but it was delicious and very spicy! Please help