I wouldn't worry too much, I know people who took time off after graduation and managed to get work....as long as you continue to do some CPD type stuff as you mention you've planned to do then I'm sure you'll be fine, 3 months is nothing in the larger scheme of things! If you're not fussy about where you work then you've a good chance of getting something.....
Whether you go away or try to get work straight after uni its probably going to be just as tricky to get work....so you may as well enjoy yourself for a bit before starting that ordeal!