When flying near trees or other objects, I like to use prop guards. I found these and I like them. They have additional extenders that are good for taking off and landing in the grass.
I hope this link takes you directly to the auction page. If not, do a search for
Propeller Guard & Increased Landing Gear for DJI Spark Drone.
As a New Spark pilot I tried to find the right combination of OEM guards and leg extensions that can be be used together but it would appear its difficult to use them together. as they both use the same way to attach to the frame. I eventually found a set with both guards and legs as where I fly I need both.
I like to quality of these and they do not appear slow the Spark down. Had one crash into a tree at low speed and no issues.