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We present HST/ACS $g$ and $z$ photometry and half-light radii $R_{\rm h}$measurements of 360 globular cluster (GC) candidates around the nearby S0galaxy NGC 3115. We also include Subaru/Suprime-Cam $g$, $r$, and $i$photometry of 421 additional candidates. The well-established color bimodalityof the GC system is obvious in the HST/ACS photometry. We find evidence for a"blue tilt" in the blue GCs, wherein the blue GCs get redder as luminosityincreases, indicative of a mass-metallicity relationship. We find a colorgradient in both the red and blue subpopulations, with each group of clustersbecoming bluer at larger distances from NGC 3115. The gradient is of similarstrength in both subpopulations, but is monotonic and more significant for theblue clusters. On average, the blue clusters have ~10% larger $R_{\rm h}$ thanthe red clusters. This average difference is less than is typically observedfor early-type galaxies but does match that measured in the literature forM104, suggesting that morphology and inclination may affect the measured sizedifference between the red and blue clusters. However, the scatter on the$R_{\rm h}$ measurements is large. We also identify 31 clusters more extendedthan typical GCs, which we consider ultra-compact dwarf (UCD) candidates. Manyof these objects are fainter than typical UCDs. While it is likely that asignificant number will be background contaminants, six of these UCD candidatesare spectroscopically confirmed. To explore low-mass X-ray binaries in the GCsystem, we match our ACS and Suprime-Cam detections to corresponding ChandraX-ray sources. We identify 45 X-ray - GC matches, 16 among the bluesubpopulation and 29 among the red subpopulation. These X-ray/GC coincidencefractions are larger than is typical for most GC systems, probably due to theincreased depth of the X-ray data compared to previous studies of GC systems.

The SLUGGS Survey: HST/ACS Mosaic Imaging of the NGC 3115 Globular Cluster System