The campaign, which will feature animated versions of the 'little dads' from Vauxhall's recent advertising, will offer kids the opportunity to win a car.
The activity will centre on family days out. These will also be promoted via a microsite, www.nick.co.uk/bigtrip, which has been created by digital design group Mind Orchard.
The site has split content for parents and children and has been designed to connect with the entire family.
An online game will invite users to create designs for Zafira and Meriva cars before racing them. Other features include printable activities for family fun on car journeys.
TV spots starring the animated dads will air during the summer on Nickelodeon. Events at family attractions such as Longleat and Woburn will also drive awareness and promote the site.
In addition, Nickelodeon-branded Vauxhall cars will appear at events wrapped in paper so that kids can draw on them.