Whenever we're going to be shooting at a venue that we know has a good vantage spot from above, we suggest doing a group photo with all of your guests. Crowd surfing on top of them is optional, but highly recommended :)
Discuss with your photographer in advance if this is an option at your venue. If it is, typically the best time to do it, is right after the ceremony. After the recessional, typically an officiant would give the guests some sort of instructions, inviting them to continue the celebration wherever cocktail hour is, etc. Just have him/her instruct your guests over to the spot where you want them and in just a minute, you'll be able to capture a photo of you and ALL of your friends and family.
You can see more images from Barclay & Makenna's wedding here.