there are many tour operators on the streets,i don't know what service they offer regards to picking up and dropping you of,maybe a little cheaper ? don't bother with the guy who approaches you selling tours,
what i can tell you for sure if you book at your hotel they will pick you up on time and return you back to your hotel,if any accidents they will take you to hospital and take care of you,they will provide you with little snacks fruit and a drink,for a few baht more well worth peace of mind,you will get a good service from TOUR EAST OR PHUKET ADVENTURE,