Cash vs card in Langkawi — how much MYR?

RM800–1,200 couple 4 nights — night market cash, small jetty tours cash, duty-free card OK. ATM Cenang Maybank foreign fee RM12 once pull RM1,000. Car rental card deposit. Island hop cash discount sometimes. Less cash than mainland rural but market stalls ringgit. Keep RM200 small bills.