The weather in October can be great. It is usually in the 70s so you can easily have a great walk on the beach or boardwalk with long sleeves or a light jacket. My kids have even swum in the ocean Columbus Day weekend.
You can always see all OC's major events for the whole year at http://ococean.com/events
Most restaurants are still open as are many of the boardwalk shops. On
weekends almost all of them will be open. Most entertainment attractions
except the major amusement parks, tour boats, and water parks are open.
You can golf, mini golf, laser tag, visit arcades, go cart, or visit the
Ocean Casino and play the slots.
There is plenty to do in OC in October, especially on weekends. There are also plenty of great events in October:
Sept 30-1 Oct is
Winefest. I've been several times and it is a great event and is a lot of fun. ot to their website fr a discount coupon.
Oct 1 is
Harbor Days (free!). I was there last year and it has great crafts and entertainment for kids and adults.
Oct 2 - 16 is
Fall Restaurant Week Oct 6 -9 is
Endless Summer Cruisin A great event that I have been to many times. The cars are great fun to see.
Oct 14 - 15 is
Oktoberfest Have a great trip!