Gave the beach an edge instead of endless void.

code/modules/awaymissions/mission_code/beach.dm

@@ -0,0 +1,37 @@
+/obj/effect/waterfall
+	name = "waterfall effect"
+	icon = 'icons/effects/effects.dmi'
+	icon_state = "extinguish"
+	opacity = 0
+	mouse_opacity = 0
+	density = 0
+	anchored = 1
+	invisibility = 101
+
+	var/water_frequency = 15
+	var/water_timer = 0
+
+/obj/effect/waterfall/New()
+	water_timer = addtimer(src, "drip", water_frequency)
+
+/obj/effect/waterfall/Destroy()
+	if(water_timer)
+		deltimer(water_timer)
+	water_timer = null
+
+/obj/effect/waterfall/proc/drip()
+	var/obj/effect/effect/water/W = new(loc)
+	W.dir = dir
+	spawn(1)
+		W.loc = get_step(W, dir)
+	water_timer = addtimer(src, "drip", water_frequency)
+
+/obj/structure/sign/terrain
+	name = "warning sign"
+	desc = "Watch your step! Unstable terrain."
+	density = 1
+	icon = 'icons/obj/stationobjs.dmi'
+	icon_state = "signpost"
+
+/obj/structure/sign/terrain/attack_hand(mob/user)
+	examine(user)