it works out great - when they want to use it. just bury it under the sand with the entrance sticking out. I've seen others use barnicles instead of rolling the PVC in superglue and then sand (like what I did - it blends in better I think with the sand).
Just put on a latex glove, smear superglue gel where you want the sand, then roll it and press sand on the superglue. spot glue it where there are bare spots.