it depends on if the tutorials are manditory or not and also the essay which u may or may not have to write ( i know u have to do on in the year but not sure about the summer layout)
if there are no manditory tutorials then thats better for you, also you can always work around the group project and have online meetings.
as for the inclass lectures, about a quarter of the midterms and exams had questions based on inclass lectures and you would only know the answers if you attended them ( because they covered some examples and concepts in class which were not on the online lectures) but if you can get your hands on a friends notes they are easy enough to follow...
so i think you could do it long distance but you should have a chat with dr. kim or who ever it is that is running it in the summer and see what componants are involved and what is doable long distance and what is not ( of course dont say your going on vacation or anything like that i dont think that would look good on you)
anyways good luck with psych 1xx3 its relatively an easier course than 1x03 and more interesting, .... and have fun on your vacation too