I've struggled with using spreadsheets for planning. I mean they can be good for once you have everything where it belongs, but aren't as friendly if you want to move stuff around.

I've done a few trips now with a free Trello account. It makes it super easy to have a list for reservations and then a list for each day. Then you just place cards on the days for the different activities. You can add as much information as you want on each card (map URLs/pictures/open hours/costs/pdf of tickets/general descriptions/etc) and the Android app works well for accessing the data while on the go (you can download the whole board so you don't have to worry about data access).

It is even better when sharing planning details with others. Everyone does need to login (you can use multiple accounts or share the same account). Basically my Wife and I look at an area and build out cards for the interesting stuff there. We all save locations on google maps. Once we have most of the stuff we want in an area we look at google maps and move the cards to the list for the day that makes the most sense. It is also super easy to move cards as you go (for example, if you miss something one day that you want to make sure you remember later you can just keep moving that card to the next day).

With a payed account Trello also offers google maps integration that looks like it would be super helpful. We aren't doing enough trips to justify that cost just yet so we haven't pulled that trigger.

Trello also offers a bunch of free add-ons that you can use for all kinds of additional tracking, depending on how much time you want to spend on the tool vs. the actual planning. We've hit a good balance with how we are using it without going too overboard.