Good gyms in Thailand

Hey I know it’s not very specific but maybe you still have some Tipps. My friends and me want to go for two weeks (I know it’s short but we all have work and family) too Thailand and train Muay Thai (we are beginners to intermediate). We look for a good personal gym. Nothing to big or super hyped. Like a small family gym. We also want to experience the Thai culture with good food maybe a few bars and nice seaside. I read about Ko samui or phuket. So you guys maybe have any experiences or recommendations or pages I can read through! Thanks a lot