Testing your pills is always preferable if you have access to a kit but I know a lot of people don't. So, my advice to you and your friend, if you plan to do it anyways, is to both, start off with half a pill each (or in the case of powder, a small line/bump each). See how it effects you and then decide whether or not to take more. If it's shitty E, something dangerous or your friend reacts badly to it (not everybody reacts well to MDMA), it'll be much easier to deal with at a lower dose. If everything is seemingly well once it kicks in, take more. You can always take more but you can't take less once you've ingested it. I know that might not sound as fun, and you might be impatient (I know how that is) but, especially for your buddy's sake, it's a safer plan. With all this shit going around as MDMA lately, and all the PMMA deaths last year, it's definitely better safe than sorry.
It really is worth the precaution... this is something I tell people all the time. Recently, in my hometown, a young girl, only 17, and some of her friends ate some MDMA (I can't remember if it was powder, pills, etc). They all got really, really sick, itchy all over, vomiting, etc and that girl died. Toxicology reports confirmed that it was actually ridiculously strong, high doses of heroin. It kills me to think that if she had of just started off with a small dose and waited to see how it affected her, she would still be alive. Way too young to go out like that.
Be careful!
As for fun things to do... when I roll with a buddy, outside of a party atmosphere, I really like going to parks, listening to music (this is a must, esp. for someone rolling for their first time, words can't describe how incredible music is on M, as you likely know!), go for walks... I dunno. I generally just like to chill in comfy, nice spots in or outdoors and talk and listen to music.