You can take the bus offered by the freeholders. It's called Ocean Ride.
You can pick it up in a few places. Get a brochure from the Ocean County Mall, or ask the transit to send you one.
You can also get a 67 bus all summer to beach from just about anywhere in Toms River main area of Rt. 37.
Once you de-bus
you can walk about 4 blocks to Seaside Beach.
Hope that helps.