Perfect way to alternate your public transport experience - just swap MTR for ferry. It's cheaper (2,6HKD weekday, 3,4HDK weekend) and more fun. Sure it takes longer but it's definitely worth it.
The Star Ferry is the swiftest and cheapest way to travel between Tsim Sha Tsui and Central or Wan Chai. The journey still feels leisurely, helped in no small part by the cooling breeze!