I am in Pattaya and believe me its certainly is NOT full of foreigners! Went to Central Festival Pattaya a couple of days ago and it was almost deserted, saw a few Indians in a group, but very quiet. What will happen in December, high season, is anyone's guess, but certainly all the hotels will not be full and obtaining a rental car will not be a problem. I have a feeling you are feeling you are being told lies by some wishful thinkers?