We approached the design systematically, separating the projects into "tracks". I was a part of a large UX team, often working on many projects in parallel.
The Hilton brand site was the most visible and well-known of all the brands, so it got a custom design.
We worked through content structure and priority with sitemaps and page description diagrams.
The booking engine is Hilton's biggest revenue generator. The relationship between finding a hotel globally within the brand, and booking a night locally on the property was the hairy-est UX problem to solve.
We designed a system for the "full service" brands: Doubletree, Embassy Suites and Hilton that allowed for custom branding within a cross-functional underlying site template.
When it came to the build, we broke the site down into its components and annotated each in an overarching dev-ready deliverable.
This project naturally had many extensions, and I was involved several other areas such as designing for the interface customers see when logging in with AT&T in their hotel rooms, to the corporate site for Hilton Worldwide.
Overall, I felt it was a productive 8 months of my UX career.
The user experience today is not only about individual interaction flows with technology, it's about the larger consumer experience of interacting with brands and services.
More importantly, it's about the human experience of seamlessly integrating change into one's life.