If you do day trips, it is possible if you drive up yourself but you won't be able to spend more time if you take a bus. The earliest bus leaves Puduraya at 9.00 am and arrives in Tanah Rata at 12.30 pm to 1.00 pm. This is using Unititi which is more punctual than the other one Kurnia Bistari which may even delay. Then the last bus departs Tanah Rata at 4.30 pm and this gives you a window of 3 to 31/2 hours which I doubt you can do anything much there except maybe walk around Tanah Rata. Or maybe take a taxi to Kea Farm or Boh Plantation and then head back to the bus station.

There are no bicycle shops in CH and you hardly see bicycles let alone rent one.

If you take the one day tour, they usually departs at 6.00 am and reach about 10.00 am and since the bus itself is the transport around CH, they can cover more places like the Sam Poh temple, Boh Plantations, Kea Farm, Bee Farm and they also can depart later, say 6.00 pm or 7.00 pm and head back to KL. I suggest you take the day tour![