you can book the same resort at some interline agencies w/no fees--it really is an exceptional buy off-season.
we did a few yrs ago and I will gladly pass a PM about a sister resort near the Arenal volcano/forest are and you can book direct w/out any agency
We booked a really cheap rental car (still ahve to pay for mandatory insurance) but get a manual compact and it's cheaper than the transfers
I'd love to get more recent details from you, please. We'd like to graduate to the Occidental Grand next time, but like you said, the Allegro is such a good value for an AI.
The zipline at Witches Rock (only 5 minutes from teh resort) is one of the best offered on that coastal area. LIR is SOOOOO convenient.