It can be annoying and sometimes daunting to see a big group when you're out on your own or in a much smaller group.
I tend to sit and chill for 5 minutes, let them pass or, if they're going the same way, let them move on out of view.
Last summer I parked up at Strumble Lighthouse in North Pembrokeshire and was pretty chuffed to find the car park empty.
While I was getting my stuff together, a bus turned up and dropped off a large group of older ladies.
One of them walked over to me and said "Oh, I'm sorry, I think we've just ruined your plan for a quiet walk."
Had to laugh, but luckily we were going in opposite directions.