Don't try out new types of film on your trip. Develop as soon as possible upon return. Pay particular attention to local etiquette and customs when photographing. If in doubt, ask. July through August is the very peak season for Europe to travel, especially south.
Single accommodations are very difficult to obtain.
Ditto for moving too quickly through or around a country. On the personal side, start a trip journal the day you decide to go. AND, drop us a postcard with some comments about your trip, please.