There is no reason for us muslims to clebrate april fools. It's history is unclear.
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http://www.muftisays.com/viewarticle.php?article=aprilfoolsAs April draws near, non believers around the globe celebrate a holiday on the first of the month known as April Fool’s Day. The traditional practice of this day is to play some sort of practical joke on someone and make him the “April Fool”.
Pranks performed on this day range form the simple, (such as saying, “your shoes are untied!”) to the elaborate. Whatever the prank, the trickster usually ends it by yelling to his victim, “April fool!”
The history of April Fool’s Day is not totally clear. No exact date can be found pinpointing the first official celebration of the holiday. There are, however, many narrations regarding the reason the tradition is practiced. One narration states that it is a day the Spanish celebrate in remembrance of the day that they defeated the Muslims and swept them from power in lower Spain. According to this narration, the Christian army could not conquer the Muslims there and sent spies to discover why. They discovered that the Muslims were strong on faith and obedient to Allah. The tradition goes on saying that the Christians sent in alcohol and tobacco, which the Muslims used and became the means in which they lost their obedience to Allah. Then the Christian army invaded lower Spain and conquered the Muslims on the first of April and began celebrating April Fool’s Day ever since. As this story has been circulating between our Muslim brothers strengthening their beliefs about the history of this day I deemed it appropriate to clarify a few points about the history of April Fool’s Day. The truth of the matter is that this story is not true in many aspects.
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April Fool's Day 
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