Well then, it sounds like you have a plan ... hang on and take the summer off. Nothing wrong with that IF you aren't feeling guilty or 'less than' or something self-depreciating thinking that sucks the life out of you. But that last line you wrote is a telling ... "a responsible career minded person would be looking for another job" so it sounds like what you are really struggling with is guilt about not looking for another job??

Here is the thing: if your plan fits your lifestyle and budget then you aren't hurting anyone and there isn't a problem with doing the job 'good enough' (and there isn't given what you've described here), showing up, doing the job decently, collecting your pay and looking forward to some time off! Someone with the integrity to want to be a good employee like you will find a job when the time feels right.