Howdy all you Hhonors Hot-shots!

I'm wrapping up my travel details for an upcoming trip to the east coast and want to see if I've covered all my bases on mileage/points to be earned...

I'm booking 4 different Hilton locations:
5k/10k/15k/20k promo

Booked online:
2500 pts. per reservation?

National Car Rental bonus:
250 miles bonus at hotel counter per location. (Although I may be booking my car with Avis unless I find a better rate.)

Are there any Avis/Hhonors bonuses?

Airline Double Dip:
I've noticed a few special bonuses - any thoughts on best? (DL, AA, UA, NWA)

Well that's what I've come up with so far. If anyone notices anything I've missed, please let me know. This is my first extensive "effort" of earning a bunch of miles/points on one trip.

Thanks for all the help on FT!

(By the way, for anyone traveling to CT soon... the Doubletree Norwalk has a 63.00 non ref. rate and a 70.00 "best avail" rate.)