I'm helping my sister in law out on her very first overseas trip. She's going to London, Wales, Scotland, and Paris this July.

I bragged about all the knowledge of this list and told her that we all could help her out. :-)

What recommendations do you have for first time overseas travelers? What about amazing things to see? Castles? Tipping guidelines? Attire? Bargains? Hotels?

Anything or anyplace to avoid in the height of tourist season?

I'm just compiling a ton of stuff for her so any help/advice would be great.

Thank you in advance, Kim in Seattle