I don't know your budget so bear with me.... I typically spend about $25 on a bottle for a hostess gift, etc. A gift for someone who sent my child to Disney, I'd spend more.
I don't mean to come across wrong but...Since they are hotel owners and drink wine, tread carefully here. They know about wine so you don't want to come across like you are giving them a fantastic rare bottle of wine and it be a standard house wine.
I would go to a wine store and speak with a pro on some good choices in your price range.
That said....here are some of our favorites:
Sterling Vineyards is good and they have a couple of different price levels. We regularly buy a Sterling Merlot for everyday about $15 a bottle. The $40 bottle is really good, we have that one on occasion. I think they have a couple pricier ones as well. Sterling has good Chardonney as well.
Caymus is unbelievable but we pay $130 per bottle at the wine store.
Limestone Hill Chardonney not sure of $
Chalk Hill Chardoney $40 range
Rodney Strong
Beringer
Kendall Jackson has some good red and white.wines and different price levels. $15 and up.
That is all I can think of off the top of my head right now.
We prefer dry Chardonney's and Merlots so my ideas are based on those 2 red and whites.
Good luck.