Vamos a pasear por el parque donde hay unos jardines y lagos muy bonitos. We are going to walk around the park where there are some very beautiful gardens and ponds.
Recogeré a Javier donde le dejé esta tarde. I'll pick up Javier where I dropped him off this afternoon.
With verbs that express movement such as "ir a", "viajar a", donde is usually replaced for adonde with no change in meaning.
Iré adonde (donde) tú quieras ir. I'll go wherever you want to go.