An adventure playground and interactive water fountains are part of what the Park has to offer visitors.

People can also take in a panoramic view of the Olympic Park and the London skyline from the top of the 114.5 metres tall ArcelorMittal Orbit.

But it proved harder than expected for pin collectors to get swapping in the surroundings of the Park.

Paul McGill, who set up London Pins in 2009, had organised a gathering in the Park for people to trade pins.

But he says security told him they could not be there, before eventually being allowed back in.

"Security came over and said you can't sell anything," said McGill.

"I made it clear we're just swapping pins but he said we couldn't be here, so we went out."

London Mayor Boris Johnson and Prince Harry have already got to grips with the Olympic Park's offerings ©AFP/Getty Images



But a member of Queen Elizabeth Olympic Park management did allow the group of about a dozen in, asking them to trade pins on the walkway leading up to the Olympic Stadium rather than The Podium which is close to the base of the Orbit.

"We're told it's all about legacy so it was strange," added McGill.

The Park - the biggest to open in London for more than a century - is free to visit.

But the Orbit is ticket-only, costing £7 ($12/€8) for children and £15 ($25/€18) for adults.

At its base is The Podium, housing ticketing, café, toilets and event space.

Work in the Park has been led by the London Legacy Development Corporation.

Yesterday, Mayor of London Boris Johnson and Prince Harry joined schoolchildren on a visit to the Park.

Work on the Olympic Stadium is ongoing ahead of West Ham Football Club moving in for the start of the 2016-2017 season.

Before then, the Stadium is due tol host games for the Rugby World Cup 2015.

Other developments on the Park include housing and a business district.

The Aquatics Centre and Lee Valley Velo Park both opened to the public last month.

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