Good luck! I have a job but hate it, so I'm on the hunt, too. You're right, filling out applications is pretty exhausting!
Stick some lines between the different sections. It's more aesthetically pleasing, and it makes it easier to read (do not underestimate how much that can help or hurt you; you do not want your potential boss to feel like reading your resume is a chore).
I was Strongly Advised by someone in one of the companies where I was applying to put an Objective section on my resume. What are you looking for (beyond "a job") and why do you want it (beyond "because money is good").
I also recommend adding a line to your Activities page saying why they're important. Your electrical engineering boss is going to care 0% about your black belt unless you advocate that it shows your commitment, leadership, ability to work with others, etc. Similarly, no one cares about high school, so cut those parts unless they are really relevant (I am not in your field, so I'm not the best judge of what's relevant, but let's say if you're applying to a job working with robots, keep it; if not, maybe think about cutting it to make room for more important information).
Do try to keep it to one page if possible, even if that means adjusting margins etc. Don't make the font tiny, though. Again, you don't want it to be difficult to read. I agree with sK0pe; all the white space on the left is a waste of room that you could be filling with information about how awesome you are. Make the heading be above and at the same margin as the text. (Am I describing that right? Like this:
Army Research Lab...etc)
That way those lines will take up less space and you can fit more stuff in.