Yes paloalto is south of San Mateo. From paloalto you can take el Camino north (it would be a long drive). The address is 2625 S. El Camino. If you traveled north on el Camino from palo alto the first indication that you would be getting close would be the hillsdale shopping mall on your left and then burgerking/ lamps plus on your right. When you reach peterpan BMW on your right, you should be able to see the "Aquarium" sign just ahead and on the right. you can park in the Al Sam florist parkinglot next door (customers do it anyway). If you are coming from palo alto, you can also find some way to highway 280 and go north, get on to highway 92 east, and then take the South el Camino exit, go to the left lane, make a U turn at Peter Pan BMW (you'll see all the BMWs), and then the store is on the right just as I stated above. From SF you could take 101 south, 92 west, south el camino exit and proceed as just stated above. From SF you could take 280 south, 92 east and proceed as stated in the sentence before the last.
Ultimate Aquarium:
2625 S. El Camino Real
San mateo, CA 94403
Tel : (650) 212-FISH
M-F 10am to 8pm
Sat 10 am to 6 pm
Sun 10 am to 5 pm
The store is a bit small and I SUGGEST that the best day to come look at stuff is Monday or Tuesday when things come in. I bet our store is nothing like what you've got in Florida, especially since the wholesalers around here supply a 7 out of 10 rating fish supply. We have been having some problems lately with cloudy eye so if you see any fish with it, we're trying to fix it. If you have any comments about the store please let me know. I work on saturdays, normally but I wont be there this coming saturday. Have a nice Visit!!!