Upon arrival @ Legazpi Airport, you have three options to reach Legazpi City proper:
Hire a Van- This is quite expensive because they tend to overprice both the tourists and locals alike but sometimes if they don't get passengers you could ask them to bring you to the central bus terminal in Legazpi for only twenty pesos (Php20).
Tricycle- Inside the compound of the airport they charge Php50.00 per trike (regardless of number of passengers). I suggest that you walk just outside the gate of the airport (which is very near) and you could get it as low as Php 25.00 depending on your bargaining skills. One tricycle is good up to 5 persons.
Walk towards the main road (Washington Drive) and ride a jeepney bound to Legazpi City proper. A good ten minutes walk (around 500 meters). So if you have a lot of luggage, just take the trike. But if you want some exercise after sitting inside the plane for almost an hour then take a walk. Turn left when you reach the gate of the airport compound then walk straight ahead then turn right towards Washington Drive where you can hail a jeepney going to Legazpi City proper. Its on your left side if you are facing the road. Fare = Php 8.00 per passenger.