Quick answer
Приро́да is nature, лес the forest, да́ча the country house almost every family has access to.
Landscape
Living things
Out there
The dacha
A да́ча is not a holiday villa — it is usually a simple wooden house with a vegetable garden, an hour or two from the city. Whole cities empty out towards them on Friday evenings in summer.
Typical mistakes
Мы е́дем в да́чу.
Мы е́дем на да́чу.
да́ча belongs to the на group.
в лесе
в лесу́
лес is one of the nouns that take a stressed -у́ after в.
Check yourself
Мы е́дем ___ да́чу.