What is the fine-grained topic of the following text: After a day of exploring Belle Isle Park, strolling down the streets of downtown Detroit or taking in such culture at the Detroit Institute of Arts, our Detroit customers love to relax and melt their worries away with a soak in one of our state-of-the-art hot tubs. Only return the topic.
Relaxing in hot tubs in Detroit after a day of exploration and cultural activities