With the temperatures spiking and the humidity going through the roof, it is a good idea not to exert yourself outside.
Working out, biking, walking, manual labor should all be avoided.
It is best to do any of these types of activities very early in the morning.
You also need to keep hydrated and keep water close at hand.
If you are coming from a cooler climate and are not use to the tropics, please understand the seriousness of not over doing it.
It does not take long at all to exhaust yourself in these conditions.