Officials say tourists will spend upward of $3 billion to catch a glimpse of the red, yellow and orange hues — and the windfall is steadily rising as the economy regains strength. Though states calculate tourism spending using different metrics, two key factors are hotel bookings and money spent on restaurant meals. States have been devoting money and manpower to marketing campaigns in hopes that fall visitors who come for the foliage stay for some of their other attractions: craft beer tasting in Vermont, history in Connecticut and mansion tours in Newport, Rhode Island. Massachusetts officials don't distinguish how much of that money is spent by visitors drawn by the foliage as opposed to Boston or the Cape Cod beaches. Because of budget constraints, Rhode Island only tracks tourism spending on an annual — not seasonal — basis; and cash-strapped Connecticut is expected to release figures in December dating back to 2006, the last time it took a hard look at travel in the state.