I grew up in a coastal town. My advice, don't act afraid. Easier said than done I know when you're not used to being around them but they pick up on fear and normally won't attack if you're not bothered. If you have food though you might need to shout or wave your arms

Most of all NEVER feed them or let them get access to your trash and shame those who do. Sounds ridiculous but they're smart and have good memories. People who feed them are idiots who are causing a nuisance. No joke I once saw a seagull knocking on the door of a house on my street with another one looking through the window like a pair of mobsters. Then when I got home my car was covered in bird shit.