380.00 ~ Fare from dumaguete to siquijor (vise versa) ~ (montenegro shipping lines)
30.00 ~ terminal fee from duma to siquijor (vise versa)
1,000.00 ~ tourist guide/driver
750.00 ~ room
200.00 ~ estimated budget for entrance fees/donations to tourist spots
500.00 ~ food budget (it depends to your food preference)

Total: Php2,860.00 (estimated budget)

Note: Much better if you have companions so that you can split the driver's fee and accomodation. You can truly save up money.

Thanks for dropping by @metapiziks!