Packages in Bir Billing. (Trekking), (Camping), (paragliding) Bir and Billing are twin destination 16 km apart and famous for paragliding along with various trekking option. Best packages for Bir Billing. Duration of Packages Activities at Bir Billing Price for Packages Stay options and Treks 1 1 Night 2 Days Camping and paragliding INR 4000/-