City trip planner tool

I am planning to go to a vacation trip (in the US) in which I want to make a number of stops in certain cities, several days each. I'd like to have a good plan of what to visit, how much time would it take, etc. So my question is - it there any online/offline tool specialized in this? I've looked through the site and there are references to road trip tools - which is not what I need, since I need specifically to plan things inside one city - and there's a reference to citytripplanner.com - but that site supports only limited number of cities. E.g. one of the cities I plan to visit is Portland, Oregon, and that site does not support it.

What I am looking for is to plan our day, accounting for public transportation, how much time roughly it takes for certain attractions, opening/closing times, etc. - something like a day planner but with a specific angle on specific city's realities. Of course, I could take a sheet of paper (or an online document in googledocs) and look up all the things and record them, but if there's a tool for conveniently organizing such information it would come very handy.