Visit the Scottish Seabird Centre (http://www.seabird.org/) at the harbour. 01620 890202. Open 10-6 every day Apr-Sep. Closes earlier in winter you can't see the birds in the dark!, but still 7 day opening. The Firth of Forth is one of Europe's most important centres for nesting seabirds. The seabird centre has telescopes for viewing the thousands of gannets in their colony on the Bass Rock, as well as webcams in various locations around the Forth islands, for viewing other birds including puffins, guillemots, razorbills, kittwakes, eider ducks. The intepretive centre is well done, with lots to keep the kids entertained. The cafe here is one of the best places to eat in the town as well, with sea-view terrace in good weather. Best times to visit are May-Jul for nesting birds, or Sep-Oct for the baby seals.
Boat Trips are available from the harbour to see the world's largest single rock gannet colony on Bass Rock at close quarters. There are 1 hour trips that take you round costing 22 pounds adult single, and 5.5 hour trips that take you onto the bass rock itself, costing 98 pounds. These need to be booked in advanced and also include a session where they feed the garnets off the boat so you get to look at them diving into the waters up close.
The Beaches are lovely to walk along, its nice and peaceful and the view of the Islands are great!
Climb North Berwick Law, a steep-sided extinct volcano, just at the southern edge of the town. Offers excellent views of the Forth Islands, and across Fife, the Lothians and beyond.