Paradise is surrounded with hardships
whereas Hell is encompassed with lusts
25) Narrated AbO Huraira that Allah's Messenger said: When Allah created Paradise, He ordered Go and see it. So he went and saw it. Then he returned and said: 0 Lord, By Your glory! who hears of it would love entering it. Then He encompassed it with unpleasant things (hardships of worship) and said: 0 Jibrael! Go (again) and see it. So he went away to look at it. Then he came back and said: 0 Lord, By Your glory! I fear that no one will enter it. The Prophet said: When Allah created Hell, He said: 0 Jibrael, go and see it. So he went and saw it. Then he turned up and said: 0 Lord, By Your glory! No one who hears of it will enter it. So he encompassed it with lusts (worldy desires) and said: o Jibrael! Go back and see it. He went again to see it and came back saying: 0 Lord, By Your glory! I fear that no one will escape from entering it
(This Haditn is fair and reported by Abu Da'ud, Tinnidhi, Nasa'i, Ahmad in Musnad and Al-Hakim in Mustadrak)
Allah has promised to give Paradise in reward to those who do good deeds for His sake. But man is misguided by the Satan and worldly lusts which cause him to do bad deeds that lead to Hell. He who undergoes hardships in the cause of Allah; these hardships will lead him to the enternal abode of pleasures.