Hi!

Since I know a little about what you've been up to, I'd say you can use points to chase eclipses

(we actually used 60K of our Hilton Surpass bonuses (100K/each) to stay 3 nights for the eclipse).
I'll let the experts chime in on the other stuff, but I think I'm one of the few on here with any Flexperks experience. For us, we are in a Delta hub and our OLD Delta cards w/US Bank became Flexperks cards way back when, so we kind-of accidentally got on board with that. What we like is the flexibility - can be used for any airline. That's also good, as we don't have great Southwest service or other competitive options (Delta dominates MSP for most destinations, it seems). I think you have more decent options, so you may have better ways to fly free. So, we have our old converted Flexperks Visa cards, but got the Flexperks AmEx cards last year when they had a 30K bonus each (enough for $600 airfare each). We did that spend, used a combined 80K points for 2 Icelandair flights to France that were just under $800/each, then cancelled the AmEx cards before the annual fee. One thing a lot of people don't like about Flexperks is that, for instance, if your flight is $399, you can get it for 20K points, but if it's $401, it will be 30K points. There is a hard line there at $400. I probably wouldn't get Flexperks with a bonus of less than the 30K we did. And, for many people, there are better cards. But, for us, they have been useful and we've gotten reasonable value.
Also, regarding the Hyatt, we just did those and got in at the tail end of the offer for 2 free nights. They have since changed it to 40K points. In our case, the rooms we booked were only 15K/night, so it would have been favorable. But, look at where you'd want to book and see if the 40K points will get you what you want (vs. the any hotel free night offer they previously had).