POSSIBLE impending proposal? haaaaalp!

My boyfriend and I have been dating since early December 2016 and we haven't looked back since. 
We've made long term plans and scheduled several vacations this summer. Our big trip to Key West is taking place the last week of July and I am hoping and praying this is when he pops the question. 
For those of you who've been through this cat and mouse game before, are there any hints, behaviors, tells that I can look out for before this happens? I hate to sound cliché but I'd at least like to have my nails done and a cute outfit on during what I hope will be an amazing & photographed occasion. 
Any insight is greatly appreciated 😍💗