Français	English
la ville / la campagne	the city / the countryside
le lac	the lake
la forêt	the forest
la nature	nature
tranquille	quiet, peaceful
nager	to swim
la piscine	the swimming pool
au bord du lac	by the lake
faire un pique-nique	to have a picnic
le bruit	noise

Tranquille already ends in -e, so it's the same for masculine and feminine: un lac tranquille, une rue tranquille.