What to wear to a water park and how to blend in?

I'm going to a water park at the end of the month, I am a skinny male with modest toned muscles who has never really gone topless in public but figure I'm too old for that now, so here goes, is it really appropriate for me to wear just swim shorts and flip flops? Do most guys wear underwear secretly underneath? I'm pretty hung and sexy and I'm worried about looking to sexual or my package looking to bluky down there, is this expected of me? Like how girls are essentially objectified in bikinis? Not trying to get into politics here I'm just really wondering, underwear underneath or no? How low or high do I wear my swim shorts? Is it too risqué to show the abdominal v lines? Or does it look dorky to go all the way up to the waist and cover the v lines up?