I stayed at a load of guest houses in Bangsaen so here's the first one, this is Breeze Guest house, rooms for 150baht for 3 hours for your short times, 250baht per night for a fan room and 300baht per night for air con room.
The area on the beach road where there is a load of them is Soi 1 Soi 2 and Soi 3, must be about 50 in total, all basically the same price, most have cable tv with English channels, dvd player, fridge, most you also get a bar of soap and towel so that saves bringing a towel, none had hot water though
During the week you won't have problems finding a hotel or guest house in Bangsaen, come the weekend the place is packed solid with holiday makers from Bangkok etc, so weekend best to phone first.
Round the back of all these guest houses is a big parking area for cars, if you park on the road parallel to the Beach Road they ask you to leave your hand brake off so they can move them about, the other 3 sois are a bit too small to park in.
Most also give you a free bottle of water.
Quite amazing some of the sheets and blankets in Bangsaen, wait till I show the "SpiderMan" one.
This room is the 300baht deluxe air con.
Contact phone numbers;
038 193 566
038 193 539
081 411 8221