Red neon warmly declares 'Glad you came up' at upbeat Loof, its name the Singlish mangling of the word 'roof'. Sit on the leafy rooftop deck and look out over the Raffles Hotel and Marina Bay Sands with a calamansi-spiked Singapore sour in hand. The great-value weekday happy hour lasts from 5pm to 8pm, with drink prices increasing by the hour.