Sessions - planned or ad hoc?

Curious if you make a plan for different solutions and activities for an upcoming session or just like to see how the process flows?

For me, it is always solo play and sometimes I like to think about the types of solutions, nozzles, and other toys I might like to use in a session. It’s also nice to think about planning a future session when there hasn’t been an opportunity for play in a while.

Of course I also enjoy the spontaneity of starting a session and just deciding what would feel good next.

For those planners, what is your dream sequence?