Heathrow airport is nearby (with low traffic, it is possible to get there in about / 16 / minutes).
Chertsey train station is near the centre of the town but it's not on the mainline so it will be slow and you'll have to change trains most of the time.
There are many ways to get in Chertsey, the main ways in are:
Via Chertsey Bridge
Via Thorpe Park
Via the M25
There are frequent buses to and from Chertsey.
The Thames is quite wide at the Chertsey stage but you cannot rent a boat at Chertsey.