i think you would want something more like a 500mm lens. i'm pretty sure you are every bit of a mile or so away from the pad so if you want a shot thats pretty "in your face", you'd want at least 500 IMO. also, the lower the f-stop the sharper and quicker the lens would be. that lens would be good for entry level though and could be used in many other scenarios. make sure you bring a tripod and i'd always stick a polerizor on the lens. $50 scratched polerizor is much better than $500+ scratched lens
you could also look into renting a lens, my dad did that when he went to ireland.