Sometime ago someone asked the difference bettwen Coasteering and Tombstoning.
Sorry for the delay:
Involves journeying along a stretch of inter-tidal zone coastline, as part of an organised group activity.
Participants travel across rocks and through water, using a variety of techniques including climbing, scrambling, swimming and jumping into water.
Appropriate safety equipment is used for this activity.
Involves jumping or diving from a height into water.
Both are similar but coasteering tends to be more organised and of course carry a certain amount of risk.