Hi Anthony,
Park in the Marina car park, it's fairly cheap.
As you enter Torreveija town (coming from Punta Prima on the N332), always keep heading right, along the seafront.
Pass alongside the open air street market, don't be tempted to go into the underground carpark which will be the first advertised parking on your right, this is very expensive.
Carry on past the street market until the road bears to the left inland to the town. Here, go straight ahead across what looks like a pedestrian area. This heads towards the pier and marina car park is on your right.
You can't miss it, as going straight ahead at this left hand "bend", only leads to the marina car park (the funfair will be on your right)
Parking costs are roughly 1€ per hour.
We are in CB at the moment, if you need more directions, PM me and I have street maps here.
Hope this helps,