What clothes to carry to visit Hongkong between 27th April to 1st May.

Only the summer clothes are enough.
For HK, the Disneyland, Ocean Park, Ngong Ping 360, Big Buddha, the Peak, Star of Avenue, Temple Street, Ladies' Street and Golden Bauhinia Square worth seeing places in HK. For shopping there, the Central, Tsim Sha Tsui area and the Citygate are good to go. If you want to taste the local snacks, you can go to Causeway Bay area.
For Macau, the Ruins of St Paul, the Lisboa, City of Dreams, the Fisherman Wharf, Senado Square, the A-ma Temple and the Macau Tower are worth seeing.