Giant Plot Holes (spoilers inside)

OK, we know that the movie is filled with Gigantic Plot Holes, so I will start with the ones that pisses me off the most : 1)The Engineers created us, and then sporadically appeared throughout human history telling us of their location, which the ancient humans drew in the form of cave paintings. Why,oh why, would you give the location LV223 i.e. your military base/ weapons lab ? It doesn't make any sense. It's like the government decided to put their missile making facilities on Google Map. 2)Meredith Vickers whom we see as a fitness queen doing push-ups at the beginning of the movie, somehow cannot outrun a crashing ship while Elizabeth Shaw who was in labour, just had a caesarian, and had given herself multiple shots of tranquilizers/ anesthetics somehow could !!! 3) How did the Engineer know where to find Shaw at the end of the movie? There is obviously another ship on the planet, so why not just go there and take off again?