Access to Herring Island Environmental Sculpture Park & Gallery is by Parks Victoria’s punt service which operates on weekends and on Australia Day from 11am to 5:00pm from the Como Landing (Melway Map 2M C2). There is a modest charge for the punt service - currently $2 for adults or $5 for families.
Como landing is at the foot of Williams Road South Yarra / Toorak where it runs into Alexandra Avenue.
You can get to Herring Island by public transport - the 605 bus stops near the Alexandra Avenue - Williams Road corner. For those wishing to make an event of an island visit you can book a water taxi - perhaps from SouthGate - and cruise to the landing on the Burnley side of the island. See http://www.melbournewatertaxis.com.au/ and note that you will need to book ahead.
Cycling to Como Landing is a pleasant trip along the Main Yarra Trail - you can hire the "blue bikes" from http://www.melbournebikeshare.com.au/ at Federation Square and enjoy a great ride and no parking worries. Chain up at Como Landing as there is no cycling on the island.
Kanteen café is located close to the landing.