I've made a few attempts at an app to help with planning trips...I know i've found them really useful, especially for longer trips where there's a lot to arrange.

Hopefully this provides the functionality you need in the simplest format.

Add all of your individual trip details as you think of them:
- transport
- hotels
- attractions & tours
- miscellaneous expenses
- notes & reminders

Then let the app show you:
- your complete itinerary.
- automated todo list.
- cost tracker.

Also provides re-usable checklists and packing lists that can be applied to each trip.