Transportation is primarily through local buses or trains, which will take you to nearby cities and towns. If you plan to rent a car, make sure to take into account the narrow and winding roads around the mountain areas. Estimated travel cost is around €15-€20 and travel time is around 1 hour.
If you have more time, further explore Grigna Regional Park and Valtellina, which offer more trails and beautiful views. If you have less time, consider skipping mountain biking and focus on the other activities.
The airport closest to Lake Como is Milan Malpensa Airport (MXP), which is 84 km away from the city. Other nearby airports include Milan Linate Airport (LIN), Bergamo Orio al Serio International Airport (BGY), and Lugano Airport (LUG).