I've found from experience the best and most reliable brand of adaptors for Australian travellers is Korjo. Check out www.korjo.com

LeighF Article on Power adapters

MOMA is well worth a visit, and if you're short on cash, has free entry between 4pm-8pm on Friday nights. It does get very crowded though...

Explorer1080635 Article on New York City

My advice would be to do as many excursions as you can. They are a great way to get to know your group, and they are always good fun.

Mike Contiki Article on Optional Activities - Europe