There are alot of travel agencies that caters good and sometimes not good price for a tour going to Pattaya or Sriracha but mostly in Pattaya as its a whole lot of a hub in everything...From where you are they have a day tour to go aome sightseeings in around Chonburi.
But if you like to travel without hassles in waiting for another people to when they will finish in the toilet, you can take a bus from the Bus Station in Bangkok, I guess, it's only 80baht /ride. Mere 1 1/2 hour or 2 to Pattaya.
Sriracha, Chonburi is about 1 1/2 hour from Bangkok by van or car! They have a great skyway that makes your travel more faster than before. There are alot of local agencies that caters transporatation to any destinations around Thailand. So you can hire a van or you can rent a car. Either ways it's okey.
You can also contact Winston agency:
As their main mode is Tuktuk, most of the family have their own motorcycle or else Taxi motorcycle is one of the best modes around the town.
I also noticed that Sriracha, Chonburi is a very small city that most of the families have their own car..because there isn't too much traffic..
The main mode of transportation in Sriracha, Chonburi is this Tuk-tuk motorcycle. The minimum is only 30baht. But if your hotel is very near in the Shopping area then you may like to walk it though.. I didn't saw any taxi's around the town and I asked one of the front desk in the hotel she told us that the main mode is motorcycles!