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Im not the best known rider through BKK but to get through there on a bike can be a bit tricky. I dont know if youre aware of that? The highway 7 from Pattaya towards BKK turns into a tollroad and motorbikes are not allowed on it from around Chonburi town. So you have to ride down to R3 and follow that. And when at the Chao Phraya River you have to take a ferry to cross it as bikes are not allowed to use bridges in and around BKK. (Actually your not going through BKK province going this way, youre going through all the Samut Hprovinces, Samut Prakan, Samut Sakhon and Samut Songkhram)
I think this will be the best and shortest and fastest way going from Pattaya to «the other side of BKK»
Any other way I guess have to be in a huge circle around BKK. Would probably take half a day more.
When your on the other side of the ferry crossing you have to ride up to R303 and then up to R35 and then westward to where you meet R4. Then you turn south and can relax....
After entering R4 southbond theres really not many alternatives along there until you are at Chumpon. (Theres a paralell road in the Cha Am-Hua Hin area but better to stay off that)
From Chumpon you can turn westwards on R4 and head towards Ranong. Then further via Khao Lak, Phang Nga down to Krabi and Ao Nang. Its longer than the alternative R41 and R44 but more enjoyable and much more to see imo.
Accomodation is nada problem to find along the way. And most of them have secure parking. I would not worry about that.
I just wonder if you gonna ride only 4 hours a day - what are you going to do the rest of the day?
Here is the spot you need to aim for to get over the Chao Phraya river: