Geography is relatively straightforward, but there's quite a lot to remember. The coursework isn't too bad, it's just writing up a case study on either human or physical geography in Year 12, and then you do some management piece in Year 13. The exams do consist largely of essay-style questions, certainly in Year 13, so it all depends really on what your strengths are and whether Geography will provide you with a wider range of opportunities in the future.
Looking at your choices they will put you in good stead in case you change your mind about whatever you want to do; I chose Maths, Physics, Chemistry and Geography, wanting to go on to do Physics at uni, and now I'm doing Sound Technology.
Also, a small piece of advice: A Levels are very passable, as long as you put the work in at home. And doing well in your AS Levels in Year 12 will make Year 13 a hell of a lot easier. I know from (bad) experience :S