Biblical references...
Worship and Singing:
Psalms 87:7... "Then those who sing as well as those who play the flutes will say, “All my springs of joy are in you.”
Matthew 4:10... "Then Jesus *said to him, “Go away, Satan! For it is written: ‘You shall worship the Lord your God, and serve Him only.’ ” 
Revelation 5:11-12... "Then I looked, and I heard the voices of many angels around the throne and the living creatures and the elders; and the number of them was myriads of myriads, and thousands of thousands, saying with a loud voice, “Worthy is the Lamb that was slaughtered to receive power, wealth, wisdom, might, honor, glory, and blessing.”
Revelation 14:2-3... "And I heard a voice from heaven, like the sound of many waters and like the sound of loud thunder, and the voice which I heard was like the sound of harpists playing on their harps.  And they *sang a new song before the throne and before the four living creatures and the elders; and no one was able to learn the song except the 144,000 who had been purchased from the earth."
Revelation 15:3... "And they *sang the song of Moses, the bond-servant of God, and the song of the Lamb, saying, “Great and marvelous are Your works, Lord God, the Almighty; Righteous and true are Your ways, King of the nations! "
Assigned Tasks:
Revelation 22:3... "There will no longer be any curse; and the throne of God and of the Lamb will be in it, and His bond-servants will serve Him;"
Revelation 7:15-16... "For this reason they are before the throne of God, and they serve Him day and night in His temple; and He who sits on the throne will spread His tabernacle over them.  They will no longer hunger nor thirst, nor will the sun beat down on them, nor any scorching heat;"
John 5:17... "But He answered them, “My Father is working until now, and I Myself am working.”
Eating and Drinking:
Revelation 2:7... "The one who has an ear, let him hear what the Spirit says to the churches.  To the one who overcomes, I will grant to eat from the tree of life, which is in the Paradise of God."
Luke 14:15... "Now when one of those who were reclining at the table with Him heard this, he said to Him, “Blessed is everyone who will eat bread in the kingdom of God!”
Revelation 22:2... "in the middle of its street.  On either side of the river was the tree of life, bearing twelve kinds of fruit, yielding its fruit every month; and the leaves of the tree were for the healing of the nations."
Matthew 8:11... "And I say to you that many will come from east and west, and recline at the table with Abraham, Isaac, and Jacob in the kingdom of heaven;"
Matthew 26:29... "But I say to you, I will not drink of this fruit of the vine from now on until that day when I drink it with you, new, in My Father’s kingdom.”
Mark 14:25... "Truly I say to you, I will never again drink of the fruit of the vine until that day when I drink it new in the kingdom of God."

Discussion Thoughts... Scripture teaches that activities in heaven will include harps, pipers, worship, singing, assigned tasks, eating and drinking...Psalms 87:7 talks about singing and music... scholars are inconclusive over where this is taking place... it may be Jerusalem of old testament times or it may mean the "New Jerusalem (Heaven)" of the final resurrection!  Revelations 5, 14, and 15 talk about singing, harpists, and choirs in Heaven. Revelation 22:3 says his servants (believers who are in Heaven) shall serve him... Revelation 7:15-16 explains who the "servants" are (believers who are in Heaven).  John 5:17 tells about God and Jesus working; it seems inconceivable that God and Jesus would be working and we would be sitting idle... one can only assume we would also have tasks (someone would have to pick the fruit or maybe the angels do that)!  Eating and drinking... the various scriptures tell about fruit from the tree of life, and that we will never again be hungry or thirsty... also mentioned are feasts and banquets!  Jesus himself in Matthew 26:29 and Mark 14:25 said he would be drinking!

My Beliefs... Whatever we will be doing in Heaven (Paradise), we can be sure it will be wonderful beyond our imaginations!  The scriptures are clear that, among many other things we will be doing in heaven, there will be music, singing, work, eating, drinking and worship!  The “work” we will perform in heaven will be quite unlike our accustomed work in this world...  our "task" in eternity will simply be to serve and worship our Savior!