[musHo_sk]

At first build a park, invite tons of people and then place a lemonade stand. (if you'll place it too early you will screw your viral ratio)

[khet]

.. or make lemonade and wait for your first few customers. Learn from their feedback, improve & iterate. Market to even more potential customers (just like you would have when you first build your park).

[cheez]

Both are valid models. In my town, there is a free water park with a REALLY expensive hot dog stand right outside.