Your talking to a climber that has minimal crack climbing technique.
If you are not a trad climber and only have a couple of days, you probably will not get a lot of climbing in at JTree at that time of year. It could be very hot, and it takes a while to sort out what's what at JTree. It is worth a visit for the beauty of the place, just set your expectations low for climbing.
If it's too hot in JTree and you want a nice area to clip bolts on moderates, check out Holcomb Valley.
When you get there, make a beeline to Belle Campground so you can be close to the action and not waste time traveling. If Belle is full, then try Jumbo Rocks and bring your digeridoo so you can join in the midnight drum circles.
Season is almost done, would be much better to hang out with me in Idyllwild. Rock quality is out of this world, splitters are actually splitters, big mountain air... oh but you gotta hike and lead, so no crowds. hope that's OK :)
If your trad skills (or experience) is minimal, Tahquitz/Suicide is not really the place to where you want to head.
Tahquitz has virtually no "sport" or even "well" bolted routes. It is upwards of 900 feet tall and most routes follow cracks (and the face climbs are mostly mixed bolts and gear).
Suicide has many bolted face climbs, but they are (with very few exceptions) "trad" face climbing...meaning it can be run out between bolts. And, at the grade levels you mentioned, there would not be a lot of bolted routes anyway.
Joshua Tree in the first part of May can be anywhere from nice (70s) to a bit warm (80+s) -- sometimes warmer. You can climb in the shade or sun, so temps can mitigated depending on the weather. There are bolted sport routes at Josh, even in more moderate grades (though not tones of them). And, many routes can be top-roped (gear anchors may be required) if leading trad climbs is not an option.
just to claify a missconception. I may have little crack climbing experience but that does not correleate to plugging gear. The graite rocks that Iam use to in MT are more like face climbes with protectable/intermitent cracks. so there is very little jaming at all.
I am aware of the heat and have been looking at annual weather averages on line and I think its doable, Which is why I was looking for rediculus easy routs.
Thanks for the links and information that really helps me figure out my plan of attack.