The best Ibaadahs during lailatul qadr are:
The beloved prophet SAW said: One who stand up (in salaah) during lailatul qadr, with conviction and hope to have reward, then he will have all his sins forgiven(Bukhari). One may perform nafils including salaat-u-tasbeeh.
2. In Tirmizi, Hazrat Aisha r.a. reported from the beloved prophet SAW that if she happens to find the night of lailatul qadr, then what is the best du`a to be read. The beloved prophet SAW answered her to read this:
اللَّهُمَّ إِنَّكَ عُفُوٌّ كَرِيمٌ تُحِبُّ الْعَفْوَ فَاعْفُ عَنِّي
Allahoumma innaka `Afouwoun Kareemoun Touhibboul `afwa fa`fou `anni.
O Allah! You are most forgiver, the most graceful, You love to forgive, so do forgive me.
3. Ask forgiveness from Allah Ta`ala. Refering from both the hadith of Bukhari and Tirmizi above, we find that the main objective through the highest night is forgiveness.
4. Read the holy Qur-aan. It is during this night that Qur-aan was revealed. Make niyat of hidayat whenever reading Qur-aan shareef.
5. Ask Salamati and peace from Allah Ta`ala. The Qur-aan talk of it during this night:
‘’Peace it is until the emergence of dawn.’’(Sourah Al Qadr)
6. Ask Allah Ta`ala a good destiny. According to tafseers, it is during this night that the issues of one year events of life, death, sustenance, sickness, etc are sealed to happen for one year.
7. Ask Allah Ta`ala barakah, blessings and abundance. Lailatul Qadr is also named lailatul mubarakah according to this ayah: “Indeed, we sent it down during the blessed night.”(44:3)
Hazrat ‘Ubaadah bin Saamit (RA) reports that he asked Rasulullah (SAW) about Laylatul Qadr. He replied, “It is in Ramadhaan during the last ten days, on the unevenly numbered nights, either the 21st, 23th, 25th, 27th and 29th or the last night of the month of Ramadhaan. Whosoever stands in ibaadah on this night with sincere faith and with genuine hopes of gaining reward his previous sins will be forgotten. Among the signs of this night is that it is a serene, quite, shining night, not hot, nor cold and (as if through the amount of spiritual light) the moon remains clear, without any rays. No stars are flung (at the shayaa’teen) at that night until the break of dawn. Another sign is that the sun rises without any radiant beams of light, appearing rather like the moon in its fullness. On that day Allah prohibits the shayaa’teen from rising up with the sun”. Reported in Durru Manthoor. Also reported in Bukhari that it rain a drizzle before Sehri. So we should look for these signs on 21st, 23rd, 25th, 27th and 29th of Ramadhaan. Each country should follow their respective dates.