abandoned beach boat coast creek decay drydock high and dry mangroves nature relaxing river sand sandy shore summer swamp urban water waterside wreck children exercise family father grass healthy outdoors outing riverside shade shadows stroll strolling sunlight sunshine trees walking bay coastal coastline Cornish cornwall cove England english Great Britain houses low natural reflections rocks rocky sea tide blue sky desert desert landscape desert rocks desert sand desert scene deserted gold sand no life no people sand and sky