If you have a low GPA, take extra courses/grad classes. It shows to the committee that you're able to handle "graduate level courses" despite a lower GPA. I put the "graduate level courses" in quote because I took 2 and they were probably 1/50th of the level of difficulty in regards to CRNA classes.
Current SRNA here. I would relax and enjoy your time off with your friends and family. If you want to study something, definitely make sure you know your CCRN stuff really well and brush up on some anatomy and physiology!