El Parque del Café
The National Park of the Coffee is one of the main tourist attractions of the Zona Cafetera in Colombia, opened on the 24th of February 1995. It features over 20 mechanical rides and more than 4000 different species of plants and trees on an area of 96 hectares.
If you are planning to go to the park first check which days it is open/closed in the calendar on the park's web page (scroll down to the "Calendario" in the middle of the page). To see the opening times and more information for a specific day mouse over the text on the desired day.
To get to the park you first need to get to Armenia. From Armenia you can take a bus to the park. In the bus station walk to the area with local buses which is located in the other end of the terminal from the disembarking platform. Just after exiting the terminal to the local buses area turn to the left and walk some 20 meters. The bus ride costs 2000 COP and takes around 40 minutes. The buses also return to the terminal from the park.
It is also possible to buy the entrance ticket to the park for the same price already at the bus terminal, very close to where the buses to the park leave from. This might be smart to avoid the risk of having to wait in a ticket booth queue at the park.
There are multiple options depending on what you want to ride. The cheapest option costs 25000 Colombian pesos. The most expensive option costs 59000 Colombian pesos, this includes entrances to almost every attraction within the park. 
There are a number of rides in the park whereas most of the aquatic ones will leave you completely soaked after taking them. If you also plan to visit these rides it might be smart to bring one or more of the following items, depending on personal preference:
Items that you do not want to get wet can be locked in lockers that are usually located not too far from the rides. To lock a locker you need to insert a 500 peso coin which you will not get back.
There are many typical restaurants inside the park.
You can eat lots of plantains, which is the local typical food.