Trees, Shrubs and Conifers: Tree suggestions wanted, 0 by Maackia

Maackia wrote:
My sister, in an unbelieveable stroke of luck, landed the gardening position with the premiere golf & CC in Eau Claire. They recently built a new club house at the opposite end of course from where the original building was, and there is a substantial amount of tree & shrub planting to be done this year. She's worked up a nice plan for the area around the club house, but is wondering what to do with an island near the main entrance. As you can see, it's surrounded by asphalt and will get pretty much full sun. It will not be irrigated and the soil is sandy and very well drained. Its about 50' in lenth, with the widest part around 30' and narrows to about 15'. She's looking for something that will provide seasonal interest, but yet be able to handle the exposed conditions and not require a lot of maintenance. She's open to all suggestions at this point, but she starts on Monday and wants to have this addressed ASAP. My suggestion was Crateagus, with 'Winter King' or 'Crusader' being likely candidates. She was thinking of going with a single larger specimen tree, but my feeling is it would look better with a grouping of smaller trees. What do you all think?