My wife and I are thinking of going to St Thomas next July. What would be the cheapst way to get an award flight there?

I had my first churn ever in November and i signed up for the following
Explorer card - 55k UA
Sapphire prefeared - 40k UA
US air - 40k
SPG card - 25k for use C&P

I also have 30k Amex MR points if that matter at all...

is it worth getting more UR points or UA to spend? i looked on UA and need about 35k miles a way for two -they didn't have saver awards? or maybe they are not posted that far in advance? don't need first class , coach is fine.

any suggestions for next churn or ways to go about minimizing cost to get there? we'll fly from IAH.