first visit to hemkund sahib for 60+ old couple

we are reaching gobindghat by 10 am on 10-6-12. can we reach gobinddham by evening on 10th itself?? Can we have darshan at hemkund sahib on 11th & return back to gobindghat on 11th itself before nightfall??what health precautions/medicines/food/clothing is suggested? is pony ride upway suggested from gobindghat to gobinddham or only from gobinddham to hemkund sahib?? is return oln pony necessary or is descending by foot okay?? is pony ride comfortable /not risky?? what is the fare for pony rides?? pl give other suggestions?? urgent please as we hv to start ion 8th from delhi. ssakal