Sorry just went back to the first page and saw you'd been on nt trips before. Ignore the general stuff I said

which ones have you done?
I've done quite a few.
In Europe: Switzerland (Wengen, Pontresina, Bettmeralp), Finland (Brown Bears), France (Provence/Camargue), Corsica, Sardinia, Sicily (in Spring), Canary Islands, Portugal (the prehistoric art one), and Menorca (in Spring)
Further afield: Zambia, Namibia, Equador and Galapagos, and Peru.
The Swiss tours focused on botany, but were good for butterflies and the mountain bird specialties. Also we didn't use mini buses for transport, just the local railways, cable cars and plenty of walking.
Corsica and Sardinia were very good for all round wildlife, with Corsica having the better endemic birds.
Sicily was excellent for migrants. The hotel was ideal for pre-breakfast walks. Set in a working vineyard we saw Bee-eater, Woodchat Shrike, Golden Oriole, and Subalpine Warbler, to name a few, in the grounds. One morning there were over 100 Bee-eater and another more than 10 Golden Oriole.