It should be starting to cool down by then! Which hotel are you staying in? It's a huge place and I can be more specific to restaurants etc around you. I've stuck a few groupon vouchers against things to give you a gauge for prices.
First off, depending which airport you're flying into then if you have a chip in your passport you can use the scanner and beat the immigration queue. Secondly, you'll be ushered into the more expensive black cabs (or hassled at the airport by a local to overcharge you in a taxi queue). You need to get in a normal taxi, these are cream / yellow. Taxis are quite reasonable and despite the metro being great, it doesn't get everywhere so taxis are good unless you're on a budget. Most hotels will have a shuttle service to populate places - Dubai Mall / Mall of Emirates / Marina / Creek
If you want to lessen the burden of expensive alcohol then BUY FROM DUBAI FREE IN THE AIRPORT. Aside from hotel bars and restaurant this will be your only place to pick it up. Most bars are happy hour from 4-8pm daily. Pick up a Time Out Dubai magazine on your way through the airport.
If you want to go up the Burj Khalifa, book in advance and it'll save you about 50%. You can also download the Entertainer app which gives 2 for 1 at certain restaurants, I can probably ping you over vouchers if you know where you want to go.
I would suggest you at least do some of the following:
- Burj Khalifa (I'd suggest at least if you don't go on the tour then try Atmosphere (bar) in there) / Dubai fountains (start at 7pm and every 30 mins after) - Thiptara or Karma Kafe are good places to eat and watch. You could have a wander around Dubai Mall from here too. https://www.groupon.ae/deals/at-the-top-burj-khalifa-6
- Burj Al Arab. I've never actually been in here and I'd been to Dubai maybe 8 / 9 times before I moved here 18 months ago. I'd suggest that if you want to get some phtos outside of it that you go to Beach Bar or better yet 360 bar in Jumeirah Beach Hotel (the wave shaped one adjacent). Failing that, the Madinat has a few nice bars and restaurants too.
- Dubai Marina. Nice walk and impressive to think this didnt exist 10 years ago. Can hire a boat relatively cheap here. Pier 7 is good for food (The Scene is Simon Rimmers restaurant but there is a bar restaurant on each of the 7 floors). The Yacht Club is good for views, drinks and food. https://www.groupon.ae/deals/open-sea-flouting-restaurant-2
- Dubai Creek. This is more authentic and away from the shiny side of Dubai. There's a nice hotel XVA which has a gallery attached in the cultural centre. Also, Creekside Cafe is nice. Wander round the textile souk then get an Abra (boat) across to the gold / spice souk, it's a dirham (about 15p). Most of the more cultural things are down this side of town. https://www.groupon.ae/deals/happy-days-sea-cruising-llc-2
- Brunch. Brunch is an institution in Dubai. You can go from 1 star to 7 star and range from 100dhs to 750dhs (about 150quid). Most tourists opt for Saffron @ The Atlantis which is about 500dhs - all you can eat and drink for 4 hours from 12-4pm on Friday. Friday's are the most popular day. There are loads of these - Mina A Salam is my favourite.
- Beach clubs. There are a few of these. Depends what you're after and went they re-open. Ibiza types vibes at Blue Marlin and Eden etc. Barasti is a bit brits abroad. Zero Gravity kind of cuts between those. There are big names playing every week but rarely planned in advance. I can let you know what is on close the time.
JBR The Walk - Cool and popular beach front amassed with hotels, bars (inside the hotels), cafes and restaurants.
Desert Safari - Land Cruiser into the desert with a local up and down dunes then to a Bedouin tent for drinks and shisha. Given the time of year I would suggest an early morning, the night tours are usually better. https://www.groupon.ae/deals/dream-night-tours-6
Water Park - Wild Wadi / Aquaventure. I'd probably suggest Aquaventure on the Palm out of the two.
Trip to Musandam (Oman) - beautiful (google it) just outside of the UAE. https://www.groupon.ae/deals/water-world-tourism-llc-5
Grand Mosque Abu Dhabi - very impressive and you can get inside, you'll have to wear a kandora if you're in shorts. It'll take about an hour from Dubai.
I know the travel heads will probably hate me saying this but a two-day ticket on the Red Bus will give you a gauge for what you want to see. Aside from the above there's Al Serkal Avenue (art galleries), shooting ranges, great golf courses, City Walk, outlet malls and Theme Parks (which should be open by your arrival but I can't comment on quality just yet)