I would decide based on how many days I was there. If it was just a few days then the rental fee (taking advice from above members on how to find a cheap rental on Siquijor) might be much cheaper than the cost of bringing your mc. Assuming you are returning to Moalboal: Compare (mc fuel cost Moalboal to Dumaguete Port + ferry cost for mc Cebu to Negros + ferry cost mc Dumaguete to Siquijor) X2 WITH (bus fares (no mc) Moalboal to Dumaguete Port) X2 + rental fee on Siquijor for mc. Other costs such as your ferry fares are irrelevant as they factor in for both choices; if you travel far from Siquijor port before hiring the mc then the cost (X2) for that part will be relevant. With all the extra ferry fares, I am guessing that renting a mc in Siquijor will win.