US Air has run a promotion in May over the past few years where they will give you anywhere between a 25% and 75% bonus for hotel point transfers. 25% was for anyone, another 25% if you had a US credit card and another 25% if you had status with US, if my memory serves me correctly.

I've used this promo with a point transfer from a marriott travel package to essentially get 1.5 US DM's for every 1 marriott point. If you have only 70k, I don't think you have enough to do a travel package however.