I guess I don't understand. If you have already met in person and hung out for a day, why would it be awkward? And if you aren't sure if you will see this person this summer or next, don't spend your time worrying! It is what it is, and worrying isn't going to make it any different. I know that is easier said than done, but seriously, try to relax and let things happen as they may.
I knew I had a great connection with my man before we met, but I didn't put my heart on the line or admit to myself any deep feelings until we had spent real time together. All of the emailing and IM'ing all those months before we met helped build a foundation, but the true connection was set for me in person.
As for alternate plans, as Carrie mentioned.. I didn't have plans made when I ventured over to meet him the first time. I did however check out hotels and had a mental note of a Holiday Inn I could stay at right near the airport if things went wrong somehow. Luckily I never needed to worry about that, but it's good to be prepared especially when traveling so far!
And as you said, you have made a great friend. So if you don't get on well in person, move on and continue to email your "friend" when you get back home. Don't put too much time in to worrying though. At 22 you have years left to worry!

Take care!