Should this be a rest week?

Last week was my longest week of training to date and my legs keep reminding me of it. My plan is to do my Monday swim and likely skip my run and just rest my legs. Well I should have rested everything. My swim has never been very good and I've resigned myself to the fact that I've probably peaked (can someone be as slow as me and still have considered to peak?). So today I figure I should try and work some on my technique and I focus on trying to rotate my body with each stroke so I'm not swimming so flat in the water. Is this supposed to be tiring? Am I moving my body too much and tiring myself out? Or is it because of my busy weekend? I had two good sessions last week so I'm hoping it's the latter. I cut my swim short and figure I'll skip my run and be done for the day. Until Chris calls and wants to know if I'm up for a ride. Like I can say no. Chris has just built up his new Cervelo P3 and he's still fine tuning it so luckily we maintain a civil pace and my legs are no worse the wear at the end of the ride. I'm still wondering if this should be a rest week.