Hi! We were just there in April this year, so it's really fresh in my mind:
Jeep: approximately 80 pesos
The jeep tour was really fun - you need a driver's license and to know how to drive standard to actually drive a jeep, but it's 4 to a jeep, so if you can't, likely someone else will be able to.
Bring lots of goodies for the kids - they line the roads - we brought stuff we picked up at the dollar store and we still ran out really quickly (pens, paper, fun stuff like mini toys, etc.)
Swimming in the cave pool was totally awesome too and you see a sugar plantation, etc.
Catamaran and dolphin: about 80 too, i think.
Heard great things about this, but ours kept getting cancelled because of rough seas. We didn't end up getting to go
Havana: Ranges I think between 100 and 160 pesos? And even more, because one is overnight.
We did the Havana Special tour, which leaves in the morning and returns around 2am. The tour itself was not good (too much time on the bus and way too little actual "guiding" in town - I know, because FI had been years ago and thought this tour was terrible and some of our friends went on the same tour by a different operator on the same day and saw way more than us. We got the impression that our guide just didn't care. He was keeping us on the bus, etc. so he didn't have to do much. And then when we had lunch they brought us to a Middle Eastern restaurant!
The Tropicana show was the highlight of my whole trip, I think. It was worth being out for so long and being tired. It was totally incredible. And the guide couldn't mess this up.
Hope that helps!
Oh yeah and you can snorkel for about 30 pesos too.