بسم الله الرحمن الرحيم
Lets take a quick tour around Jennah and get more acquainted with its inhabitants shall we?
The Prophets River called al-Kawthar, is river found in paradise through which anyone from the Prophet's ummah can drink from. On Yaum al-Qiyamah (the Day of Judgement) all of those who truly believed in Allah will be led to al-Kawthar where they will drink once once, and will never feel hunger or thirst again.
Fountains called Salsabil, it is a fountain that flows into a river. Allah says "And they will be given to drink there of a Cup (of Wine) mixed with Zanjabil," [Quran 76:17-18]
The Bridge called as as-Siraat, upon it will be lined all those that you have wronged, so that they can extract their justice. As only the pure will enter Jannah. And the trials in duniyah, death, the grave and qiyama are all stages where purification can occur.
A Tree called Tuba, whose width is a hundred years, and the clothes of the people of Paradise are taken from its bark and the trunk is made of gold. If a rider travels in its shade for one hundred years, he would not be able to cross it.
....Do you know how to Plant Trees in Jennah?
The Prophet of Allah (salAllahu `alaihi wa sallam) said: In the night of Isra when I met Ibrahim (alakyam salam) he said: O Muhammad (salAllahu `alaihi wa sallam) tell your people that the heaven has pure soil and sweet water but the land is bare. If they want to plant trees in the heaven, they should say Subhan Allah Al-Hamdulillah and Allah Akbar.
7 Levels of Jennah, each level is divided into hundreds. Al-Firdaws which is the best and highest levels of them all. Above it is the throne of the Most Merciful, and from it originates the rivers of Jennah. In the Lowest level, you will get the Earth multiplied by 70 in terms of space.
Once the Rasul (salAllahu `alaihi wa sallam) concluded the description of Paradise with these words: There would be bounties which the eye has not seen, the ear has not heard and no human heart has ever perceived them.