Hi Ros, as i mentioned, most likely your tour guide will request to fetch u from your hotel to megamall opposite BC ferry terminal.. But of cos you can request not to follow them. But please remember your ferry timing. If you do not know, please ask your tour guide as they are the ones helping you to book the return ferry ticket.
Around 10am, you can take a cab down to Nagoya Hills for your lunch + last minute shopping, after which, take a cab to BC ferry terminal. it costs around Rp50,000. Please make sure you seek your tour guide advises to collect the return ferry ticket personally at the counter.
Last but not least, Please be reminded to be at the ferry terminal 45min to 1 hour before departure.