Hi, It's a really nice park and it's well worth a visit. However, there isn't enough there to spend a full day. Maybe two or three hours at the most and that's if you spend time in the tower and get something to eat there. After visiting the park and tower you could then make your way to the metro at the Vienna International Centre station on the U1 line. From there you can easily visit other parts of Vienna. Hope this was some help to you.