I get water in the ear quite often surfing, I hate it. I've found the best way to clear it is to tip your head to one side (water filled ear pointing up), put a little more water in, feel it trickle in a bit (to meet up with the trapped stuff) and then turn your head over quick so your watery ear faces down and it usually gets the lot to trickle out in one go.
Seriously mate, get ear plugs or use putty in them! I also surf and the amount of ear infections I have had is ridiculous due to F*cking dirty water getting in my ears (that code for sewage people) even in the most popular beach resorts in the uk. Its disgusting! Had 3 10 day courses of antibiotics last year to get rid of 1!