iOS Universal Travel
Tours is an amazing travel planner:
Plan your visits — organize location, contact info, prices, notes and opening hours;
Add events to calendar;
Explore Wikipedia and Foursquare places, save it and rate it;
Auto-grouping by cities and ability to set location-aware notifications;
WikiTravel news — check that country you are going is safe to visit now;
Print or share info about city places as "brochure".
Works on both iPhone/iPad, Retina ready.
"Continued use of GPS running in the background can dramatically decrease battery life."