@Casey ********
another 200 for bus back. Depending on where you wanna stay can be another few hundred to your hotel or into middle of the city. Obviously there are minor expenses also such as bus across the bridge for 30 baht, food, alcohol etc, they do have a very nice market along the beach, so best to see it as a nice day out that's what I did, takes away the stress of border runs. Immigration is extremely friendly from what I experienced.