The vehicle ferry will take you to the islands from Redland Bay Marina, or collect you on the islands and return you to the mainland. The trip takes an hour and costs $120 single way for a car.
I left on the 6.30am ferry from Russell Island and traveled to Redland Bay Marina. Sat in my van and played the ukelele to myself to the amusement of the Ferry attendant. It sure passed the time happily for me.
The passenger Ferry takes people without cars to the mainland. Many on here at 6 am would be on their way to work. Many have cars parked at the Marina. Others use the bus service which is very good and takes you anywhere in the Brisbane area. There is an express bus that goes to the city in one hour leaving at 6am 6.30 and 7,30am every weekday.