adventure branch forest kids natural environment nature nature reserve pile piles plant playground tent tents tree trunk wood wooden woodland woody plant brown Denmark Forest Floor grass green land May nordic Nordic nature north scandinavia scandinavian nature spring summer white yellow cloud countryside England english field Great Britain landscape meadow peaceful quiet rural sky Surrey Hills track tranquil trees bridleway environment exercise footpath natural path Sussex trail walk bracken coniferous ecology pines quality shade sunlight chalky changeable clouds crop farm hedge hill moody shadow slope varying bank blue freeze frozen ice icy January lake pond shore water winter fresh hills South Downs autumn beautiful beauty course flow river Symonds Yat view wye