There are several Lo Crispins. If it is the one near Quesada, from Torrevieaj go up the CV905 (the one that goes past the big Carrefour) and head towards the AP7. Go up to the Quesada roundabout and go all the way around to head back towards Torrevieja (If I remember correctly, you can't turn off to Lo Crispin from the right hand side of the CV905) and then take the first right to Lo Crispin. Coming from the AP7, simply take the 3rd turn towards Torrevieja on the CV905 and then take the CV905 at the Quesada roundabout. The turn for Lo Crispin is the 1st on the right and is signposted.
There are 2 Lo Crispins in Guardamar and another one near Formentera. Any of these?
For a map, use this link http://maps.google.co.uk/maps?ie=UTF8&ll=38.130236,-0.63446&spn=1.613839,3.4552&z=9&om=1
and you will see all the Lo Crispins. (Highlight the link, copy and paste into your address bar).