Two hints that allowed me get the scenes that I wanted (mind you I do not aim for 100% scenes during a single playthrough)
- Get to the library and get the stats needed to borrow the lewd books. You can then spend your free time (the time before anyone is home) reading the books in the bedroom. This will get you the stimulations to level up the stats you need for the scenes.
- Be wary of spending money before the vacation starts. You will need around $60-70 to get everything you need to get all the scenes when the vacation starts. I do not remember the exact amount but it around that ballpark.
With these you should have no problem unlocking all the scenes for Tom(?). For the camping trip scenes I remember seeing a walkthrough somewhere here in the comments. I have yet to unlock the cafe-helper scenes but the stimulations from the books should help gain those stats as well.
Hope that help!