Hi! I was wondering in your opinions, which would be the most rewarding if time is a factor while on the Rd to Hana. We have a lot of stops we want to do on the RTH and both of these items were referred from someone for us to check out. We are coming to Maui the end of Oct. and 1st week of Nov. The cost for the lava tube is kind of pricey in my opinion and I've seen the Thurston on Big Island which was spectacular. Personally I am leaning toward the hike on Pipiwai Trail, but have 2 others to consider. My mom is 80 and pretty physically fit...do you think she could do the trail to the waterfall if we take it slow, or would the Lava Tube be more suitable? The trail doesn't look really steep or difficult, but we have never done it and would like some experienced opinions. Would you take a senior on the trail? Thank you for your help! Aloha!