Mai Pen Rai is'nt only a translation of 'no problem' here, Maipenrai is as well the name of a popular place here.
Whatever it could be that you are looking for, there is something for everyone. Koh Phangan offers more than 300 resorts to choose from, everything from a backpacker style 120 Thai Baht a day wooden hut with no toilet to top notch aircon accommodation with your own pool.
Khaolak's climate is usually moderate and perfect for a holiday. Nice weather days and a refreshing sea breeze regulary. For the leasure traveller, end of December to late of March is mostly the ideal tropical weather experiences.