HHQX888 This is our schedule and I know he'll want a day at Atlantis.
Day 1 - Thur arrive 11:30pm
Day 2- Fri
Day 3- Sat
Day 4- Sun
Day 5- Mon
Day 6- Tue depart 2:25am
I don't want to waste 100,000 points on night 1 or night 5 since we won't get out to Al Maha until well after 1:30am or so. We would also have to leave around 11:30pm on the last night.

Night 1 since so late I was thinking Le Meridien by the airport.
I was thinking drive out early on Day 2 to Al Maha.
They will let us do two activities on Day 2 and two on Day 3.
We could head out early on Day 2 and return after to Dubai after lunch and maybe late check out on Day 3
I'm thinking either W Palm Dubai, Grosvenor House or JW Marriott. Rates are good especially with my travel agency's Stars/Luminoso program. The value is much better than using points.
On Day 3/4 Sat/Sun we could spend the night in Dubai and see the sights such as Burj Khalifa. Atlantis is closed on Sunday.
On Day 5 Mon we could go to Atlantis and then eventually to the airport. I would keep my room on Monday night wherever we choose or if they didn't want to offer a late check out, I would reserve the Meridien at the airport for this night and head out there after Atlantis around 5pm-6pm to have a place to rest and shower before the flight as the Meridien is only $75. We could then head to DXB around midnight.