1. Hire out accessible office building balconies in Sydney, or park space
2. Get a bunch of beach chairs
3. Put up lots of beach umbrellas (for the sun and rain?)
4. Hire out the beach chairs for lunch and nap afterwards

• Pump up lots of beach balls for decoration (and to keep the kids busy)
• Complementary sun block if they don't want to stay under the umbrella - though sun burns during lunch probably is great advertising.
• Soothing beach sounds and music

Premium service

• Martini, Coke, Tea
• Clean beach towels for hire.
• Alarm clock fitted to the previously mentioned beach chairs
• Wind breaker walls - I imagine on top of office buildings in Sydney the wind will be quite big

The company will be called "5 Minutes to Beach Paradise"