Tell her what you told us, but more succinctly and with tact.
If she is a true friend she will appreciate whatever you do together should be enjoyed by both (or it'll not last). Say that the places she chooses are rather fancy for your personal tastes, and could you both opt for venues a little less lubricious ? Or maybe she choose a place one occasion and you the next etc. ?
As for other things, that is a separate issue really. If you enjoy each others' company then make a few suggestions for additional trips or whatever.