We spent a weekend in Vina Del Mar, which was enough to walk around and get a feel for the place. The weather was good and the sandy beaches were packed full of locals or people that had escaped from Santiago for the weekend. It was more modern and beach-orientated than Valparaiso (which only had the large industrial harbour) and we spent most of our time walking along the promenade checking out the stalls and eating at beach side cafes. We also watched the various sea birds and pelicans diving for fish very close to the shore.
We stayed at the Hotel Monaldi, and apart from also checking out the main shopping street, a shopping mall (which is no different to any other shopping mall on earth!) we walked by the 'clock of flowers' (Reloj de flores), palace and casino. Around midday on the Monday we caught the bus back to Santiago.