Tallinna Lauluväljak, or Tallinn Song Festival Ground in English, is a massive field and park area with a song ground in the centre, situated in Kadriorg district, basically just a bit outside of the city centre. The sea is just nearby as well. I recommend visiting this place firstly because it is really beautiful and nice views can be seen from the upper part of it, and secondly because it is a really important place for the Estonian nation.
The famous Singing Revolution was held at Lauluväljak in 1988, which led to the overthrow of Soviet rule. Moreover, every 5 years the Estonian Song Festival is held at Lauluväljak which gathers hundreds of thousands of people. It has been a continuous tradition since 1869 and since 1923 and it is always held in Tallinn. 2019 is one of these years — the 27th Estonian Song Festival will be taking place between July 4th and 7th. Don’t miss it!
Moving away from the cultural information about the area, it is a great place to walk and have a great time surrounded with fields and trees. I personally like starting my walk from the seashore to the upper part of the area. When you reach the upper part of the area, you will get rewarded with a beautiful view and a “singing” bench from which famous Estonian songs can be heard.