If you go High Lodge in Thetford Forest you can hire bikes and there are four coloured routes to do.
Green is easiest just over 6 miles and pretty flat.
Blue is just under 9 miles.
Red which is closed unfortunately for revamp is 11 miles.
Black run for experianced riders, jumps etc
You can hire good bike for £11 for two hours.
Go early around 10am as it gets very busy at weekends,holidays.
Did a Blue and green today but not great for wildlife today but seen an Adder in the past ;-)