Some other suggestions, although not necessary - Travel pillow, chewing gum (especially for those who have ear problems during flight), book and/or ipod and one change of clothing (air lines do lose luggage occasionally)

scuba_Nikki Article on Carry on luggage

Cafe lattes, bruchetta, chianti, gnochi, limoncella, baci chocolates, gelati, pizza, it's impossible to not try everything in Italy.

Krista Article on Italian Food and Drink

For a great view of the city (especially at night) go to the top of the Eiffel Tower at Paris. It also offers a great vantage point for viewing the water show at the Bellagio.

cdm115 Article on Las Vegas Casinos