My go-to for booking and info – Tripadvisor: Plan & Book Trips Review

I use this a lot to research locations and hotels. Easy to use, reasonably comprehensive, and finds good rates for locations that we travel. Like most apps however, sometimes it just goes away and I have to start over. Prefer web sites to apps, but this one works well on my iPad.
Review by ElliottAH on Tripadvisor: Plan & Book Trips.