For ladies I would definitely recommend finding some slightly nicer than normal black flats... I bought some in Prague for super cheap and still wear them all the time!

Explorer1080592 Article on Shoes and Footwear

My tour guide Drew taught me to tip well at places like Moose & McGillicuddy's. The staff will be more attentive to your needs and pour you bigger drinks!!

Melsie Article on San Diego

If you are doing a time out tour (staying in hotels), a travel iron/hairdryer will come in handy as many european hotels do not provide these facilities.

Vicki - Contiki Staff, Europe Article on Suggested packing list - Europe - Summer