I think there is nothing more relaxing than walking by the water. I work 10 mins from the beach so I usually walk for about 45 mins during my lunch break & as it isn't a swimming beach (too many rocks) it is a great escape. I very rarely see people which leaves me to my thoughts. Otherwise if it is too hot during the day (I live in central QLD) then I do laps in the pool at lunch then go for a walk around a lake that is just by my house. Great walking track & usually only a few people fishing at that time of day.