Buses running between the nearby larger cities (Phitsanulok, Khon Kaen, Phetchabun) usually (but not always) stop at Lom Sak's bus station. There are also buses direct from Bangkok's Mo Chit bus stati...
Daily fast boat transfer, Crossing takes 25-30 min depending on sea conditions. Private charters are available and rates are subject to negotiation. Departure from Sanur Beach to Mushroom Bay at 8AM, ...