Welcome to FT, ScarletEd2!

A quick check of the Continental One Pass website shows your options include magazine subscriptions, a merchandise website and online auctions which offer merchandise. You can also donate miles to charity.

That said, 300,000 is a fair amount of miles, and using them for merchandise won't give you a pretty low value on a per mile basis (something FTers are always very conscious of). Any chance you'll be able to resume flying before the miles expire? You can also maintain the balance past the expiration date by using Continental's affinity credit card or doing business with one of their partners.