Airmanship isn't about rights it's about responsiblity and good manners. If you fly a powered aircraft it's only good manners to avoid parachuting sites and gliding sites, quite apart from it being a good deal safer!
I flew back IFR from Alderney yesterday at 5000ft in the Class G as I'm entitled to do, however my track took me over and close to gliding and parachute sites as well as danger areas, all of which I avoided by minor changes to track, or crossed with a suitable radar service.
It's not hard for heaven's sake, they are all on the charts, the GPS will tell you precisely where you are, the rest is pretty basic navigation!