Ibn 'Abbaas (Radi Allahu Anhumah) reported that the Prophet Muhammad (Sallalahu Alaihi Wasallam) said: " There are no days in which righteous deeds are more beloved to Allah than these ten days." The people asked, "Not even jihaad for the sake of Allah?" He said, "Not even jihaad for the sake of Allah, except in the case of a man who went out to fight giving himself and his wealth up for the cause, and came back with nothing." ( Related by Bukhari ).
Hajj Story Board Game, Hajj Book of Opposites, Mixed Media Hajj Activity,
Hajj Activity: Introduction to Addition & Subtraction, Ka'aba Sequencing Activity, Hajj Game for Preschool and Kindergarten, and
Hajj Theme Pack by A Muslim Child Is Born all geared more towards younger kids
Hajj for Kids by Productive Muslim has a great list of activities for kids.
Umm Maimoonah has a list of Hajj resources with activities for older kids too
Hajj Day By Day- a flash presentation by the Ministry of Hajj
"The Messenger of Allah (SAW) said: 'The best supplication is the supplication on the day of Arafat'. [at-Tirmidhi and Malik]
Supplication (dua) on The Day of Arafah (9th of Dhul Hijjah)
‘The best of supplications is the supplication on the day of 3arafah and the best which I and the Prophets before me have said (is):
لَا إِلَهَ إِلَّا اللهُ وَحْدَهُ لَا شَريكَ لَهُ، لَهُ المُلْكُ ولَهُ الحَمْدُ وهُوَ عَلَى كُلِّ شَيْءٍ قَديرٌ.
"La ilaha illal-lahu wahdahu la shareeka lah, lahul-mulku walahul-hamd, wahuwa 'aala kulli shayin qadeer."
‘None has the right to be worshipped except Allah, alone, without partner. To Him belongs all praise and sovereignty and He is over all things omnipotent.’