Means of transportation for 30 days Sri Lanka (for tall guy)

Hello everyone!

Me and my girlfriend are visiting Sri Lanka for a full month, starting on the 12th of december. Super excited!

Our itinerary is roughly shaping up to be (but feel free to give tips if we missed anything!):

Negombo --> Sigiriya --> Kandy --> Haputale/Ella --> Tissamaharama --> Sinharanja / Deniyaya --> Unawatuna --> Galle --> Colombo --> home :(

We are looking into how to get around, but since there is a lot of contradicting information, it is HARD.

We are looking into a tuktuk for the full trip. The flexibility, not being dependant on anyone, and seeing a lot while travelling are big advantages. I generally like driving abroad, and have driven a motorcycle through Vietnam. However, we are a bit anxious for the long drives, especially since I am about 2 metres tall. Does anyone have experience or some usefull insights on this?

The alternative would be a combination of public transport or private transfers for the longer trips, and local tuktuks/taxi's for shorter trips (e.g. through PickMe). But I generally feel that would be more of a hassle, more scammy and far less flexible. A friend warned me for the overcrowded and slow busses as well.

We have ruled out a private driver for the whole trip. It is expensive and we would feel very uncomfortable to have someone waiting on us the whole time we are sightseeing and stuff.

Very curious to see what you guys have to say! Thank you!