The 'Heart of Sharjah'
An alternative, which I'd highly recommend, is brunch at Sharjah's Radisson Blu - it's alcohol-free, which is a plus point for anyone who'd rather avoid the stuff on a Friday afternoon (or who just generally avoids the stuff) and it comes with a pass to the pool and beach thrown in so you can turn up (no traffic on a Friday, folks!), brunch to your heart's content and then flop down to the poolside and crash on a sunbed while the kids try to kill each other in the pools. There are three of these, by the way, as well as a beach.
If you're up for it, an overnight there right now will cost Dhs 279 a room which is hardly going to break the bank. The brunch package is Dhs 120 for adults and Dhs 60 for kids, which is basically your Friday sorted right there. The restaurant is surrounded by the UAE's original hotel indoor garden, waterfalls, koi carp and all and the food's excellent.
You're also all set to explore the Souk Al Shanasiyah at the Heart of Sharjah, the Al Naboodah house and the city's divers other museums (the museum of Islamic Civilisation is a short walk away), art galleries and attractions (the urban garden is lovely, Fen Café makes one of the world's most shockingly good chocolate cakes) as well as booking a 15 minute slot at Rain Room, taking a tour around Sharjah Aquarium or maybe tootling across town to explore the Wasit Wetland Centre. There are plenty more things to do/explore, too, including loads for kids - the rides and things at Al Montaza Park, the Discovery Centre and the Car Museum come immediately to mind, but there's plenty more where they came from.
You're basically looking at a whole weekend break with loads to see and do for a couple for the price of one of those Dubai 'bubbly brunches' for one. I mean, what's not to love?
