Perhaps this is manageable for a young man who is able to complete the NTU round-island Bike Rally, but we need to provide accessible cycling routes for all people along these park connectors. This is something LTA needs to look into.
See also Adrian Loo's, "Park Connector Ride – Bishan to Kallang waterside park." Lekowala, 13 Dec 2011, which we describes the ride in some details and highlights the crossings. This post was featured here earlier.