Marekjoz - the white bird with the orange beak I believe is a Common Tern but you can go to whatbird.com to verify if uncertain
Here's a crisp shot of a Heermann's Gull taken at Dana Point Harbor on 9/28/12. The bird is listed as Near Threatened. Taken with a Canon 5d Mark III and a 400mm L 5.6. Settings were 1/1600, F6.3, ISO 400, + 1/3 EV, Tv mode.